Alert archive / California / Red Flag Warnings in 2017
Red Flag Warning 11, NWS Los Angeles, CA
NWS Los Angeles, CA issued this red flag warning at Dec 15, 2017, 1:57 PM PST for Los Angeles County, California. It took effect at Dec 16, 2017, 9:00 PM PST. It was in force for 23 hr. 10 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Dec 15, 2017, 1:57 PM PST (21:57 UTC)
- In effect from
- Dec 16, 2017, 9:00 PM PST
- Expired
- Dec 17, 2017, 8:00 PM PST
- In force
- 23 hr
- Issued by
- NWS Los Angeles, CA
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 21:59 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 17, 5:56 AM PST | NON-TSTM WND GST 60 | 5 S Santa Clarita, CA | MESONET STATION NHPC1, NEWHALL PASS. |
| Dec 17, 6:35 AM PST | NON-TSTM WND GST 53 | 2 Ne San Fernando, CA | MESONET STATION E8724, SYLMAR. |
| Dec 17, 6:43 AM PST | NON-TSTM WND GST 54 | 2 Wnw Burbank, CA | ASOS STATION BUR, BURBANK (BOB HOPE APT.). |
| Dec 17, 7:25 AM PST | NON-TSTM WND GST 62 | 2 Nw Malibu, CA | MESONET STATION D1664, MALIBU. |
| Dec 17, 7:55 AM PST | NON-TSTM WND GST 65 | 5 Nne San Fernando, CA | MESONET STATION CNIC1, CAMP NINE. |
| Dec 17, 8:34 AM PST | NON-TSTM WND GST 64 | 7 Ssw Woodland Hills, CA | MESONET STATION D2363, SADDLE PEAK. |
| Dec 17, 8:55 AM PST | NON-TSTM WND GST 50 | 8 Wnw Malibu, CA | MESONET STATION LCBC1, LEO CARRILLO. |
| Dec 17, 8:56 AM PST | NON-TSTM WND GST 65 | 8 Ssw Woodland Hills, CA | MESONET STATION MBUC1, MALIBU HILLS. |
| Dec 17, 9:53 AM PST | NON-TSTM WND GST 52 | 8 Ese Castaic Lake, CA | MESONET STATION WMSC1, WARM SPRINGS. |
| Dec 17, 9:57 AM PST | NON-TSTM WND GST 60 | 2 N Santa Clarita, CA | MESONET STATION SAUC1, SAUGUS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 10.0 hours before the alert went out and 184 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4905 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- -22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
425 WWUS86 KLOX 152157 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING IN EFFECT FROM 2 AM TO 10 PM PST SATURDAY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND ADJACENT FOOTHILLS OF THE SOUTH COAST DUE TO GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES LATE SATURDAY NIGHT THROUGH SUNDAY EVENING... .DISCUSSION...After the passage of an upper level disturbance, there will be increasing upper level wind support and cold air advection that will bring strengthening north to northeast winds across the mountains and adjacent coastal foothills of Santa Barbara county (including the Thomas Fire) late tonight through Saturday evening, with gusts of 30 to 40 mph being common. Due to the stronger winds in the upper atmosphere, there is the potential for locally stronger gusts across exposed ridgetops on Saturday. The combination of these gusty winds with humidities generally ranging between 10 to 20 percent will result in critical Red Flag conditions across the Santa Barbara County mountains and adjacent coastal foothills, mainly east of Santa Barbara. As a result, there will be an increased threat of very rapid fire spread, long range spotting, and extreme fire behavior across the warning area, including portions of the Thomas Fire incident. For the remainder of Ventura and Los Angeles Counties, the flow is expected to shift to the northeast by Saturday evening, with a threat of increased Santa Ana winds and low humidities late Saturday night into Sunday when gusts between 35 and 55 mph will be likely. A Red Flag Warning is in effect for late Saturday night through Sunday evening for much of Los Angeles and Ventura Counties. CAZ246-253-254-161800- /O.UPG.KLOX.FW.A.0012.171217T0900Z-171218T0400Z/ /O.NEW.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty northeast winds and low relative humidity, which is in effect from 1 AM to 8 PM PST Sunday. The Fire Weather Watch is no longer in effect. * Winds...Northeast winds are expected to peak late Saturday night into Sunday morning at 20 to 35 mph with gusts 45 to 55 mph. Isolated gusts to 60 mph possible. * Relative Humidity...Humidities above 15 percent will be possible late Saturday night, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ244-245-288-161800- /O.UPG.KLOX.FW.A.0012.171217T0900Z-171218T0400Z/ /O.NEW.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty northeast winds and low relative humidity, which is in effect from 1 AM to 8 PM PST Sunday. The Fire Weather Watch is no longer in effect. * Winds...Northeast winds are expected to peak late Saturday night into Sunday morning at 15 to 30 mph with gusts 40 to 50 mph. * Relative Humidity...Humidities above 15 percent will be possible late Saturday night, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ547-161800- /O.UPG.KLOX.FW.A.0012.171217T0900Z-171218T0400Z/ /O.NEW.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Los Angeles County San Fernando Valley- 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty north to northeast winds and low relative humidity, which is in effect from 1 AM to 8 PM PST Sunday. The Fire Weather Watch is no longer in effect. * Winds...Northeast winds are expected to peak late Saturday night into Sunday morning at 15 to 30 mph with gusts 35 to 45 mph. Strongest winds northern and western portions. * Relative Humidity...Humidities above 15 percent will be possible late Saturday night, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ240-241-161800- /O.NEW.KLOX.FW.W.0011.171217T1400Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING IN EFFECT FROM 6 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty north to northeast winds and low relative humidity, which is in effect from 6 AM to 8 PM PST Sunday. * Winds...Northeast winds are expected to peak late Saturday night into Sunday morning at 15 to 25 mph with gusts 35 to 45 mph. * Relative Humidity...Humidities above 15 percent will be possible late Saturday night, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ239-161800- /O.EXA.KLOX.FW.W.0010.171216T1000Z-171217T0600Z/ Santa Barbara County South Coast- 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING IN EFFECT FROM 2 AM TO 10 PM PST SATURDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS MAINLY SANTA BARBARA EASTWARD... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty north to northeast winds and low relative humidity, which is in effect from 2 AM to 10 PM PST Saturday. * Winds...Areas of north to northeast winds 15 to 25 mph with gusts up to 35 mph...strongest in the foothills from Santa Barbara eastward. * Relative Humidity...Minimum values 10 to 20 percent in the foothills. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ252-161800- /O.CON.KLOX.FW.W.0010.171216T1000Z-171217T0600Z/ Santa Barbara County Mountains- 157 PM PST Fri Dec 15 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 AM TO 10 PM PST SATURDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND ADJACENT FOOTHILLS... * Winds...Areas of north to northeast winds 15 to 30 mph with gusts to 40 mph in the mountains and adjacent foothills. Locally stronger gusts possible across ridgetops. * Relative Humidity...Minimum values 10 to 20 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ GOMBERG/SMITH
7 follow-up statements
271 WWUS86 KLOX 161746 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING IN EFFECT UNTIL 10 PM PST THIS EVENING FOR THE SANTA BARBARA COUNTY MOUNTAINS AND SOUTH COAST DUE TO GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES LATE TONIGHT THROUGH SUNDAY EVENING... .DISCUSSION... Strong upper level winds behind the passage of an upper level disturbance combined with strengthening north-south pressure gradients caused a significant increase in winds across the Santa Barbara county mountains and south coast this morning, causing major impacts on the Thomas Fire. Wind gusts of 35 to 50 mph have been common this morning across these areas, with isolated gusts up to 65 mph being observed in the Montecito Hills. While humidities have modified somewhat this morning, the strong north to northeast winds through this evening will continue to maintain dangerous Red Flag conditions for the Santa Barbara county mountains and south coast. As a result of these strong winds, there will be very rapid fire spread, long range spotting, and extreme fire behavior observed at the Thomas Fire and any new fire ignitions. In addition, there will be gusty north winds across the Ventura county mountains today, especially near the Highway 33 and Interstate 5 corridors which will impact the Ventura county portion of the Thomas Fire. For the remainder of Ventura and Los Angeles Counties, the flow is expected to shift to the northeast this evening, with increasing Santa Ana winds overnight into Sunday when gusts between 35 and 55 mph will be likely. A Red Flag Warning is in effect for late tonight through Sunday evening for much of Los Angeles and Ventura Counties. CAZ246-253-254-170000- /O.CON.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast winds increasing this evening, peaking late tonight into Sunday morning at 20 to 35 mph with gusts 45 to 55 mph. Isolated gusts to 60 mph possible. * Relative Humidity...Humidities above 15 percent will be possible tonight, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ244-245-288-170000- /O.CON.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... * Winds...Northeast winds are expected to increase this evening peaking late tonight into Sunday morning at 15 to 30 mph with gusts to 50 mph. * Relative Humidity...Humidities above 15 percent will be possible tonight, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ252-170000- /O.CON.KLOX.FW.W.0010.000000T0000Z-171217T0600Z/ Santa Barbara County Mountains- 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND ADJACENT FOOTHILLS... * Winds...Areas of north to northeast winds 20 to 35 mph with gusts to 55 mph in the mountains and adjacent foothills. Isolated gusts up to 65 mph across favored ridgetops. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ547-170000- /O.CON.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Los Angeles County San Fernando Valley- 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...Northeast winds are expected to increase this evening, peaking later tonight into Sunday morning at 15 to 30 mph with gusts to 45 mph. Strongest winds northern and western portions. * Relative Humidity...Humidities above 15 percent will be possible tonight, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ239-170000- /O.CON.KLOX.FW.W.0010.000000T0000Z-171217T0600Z/ Santa Barbara County South Coast- 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... * Winds...Areas of north to northeast winds 15 to 30 mph with gusts to 50 mph below passes and canyons. Isolated gusts to 60 mph in the foothills. Strongest winds Santa Barbara eastward. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ240-241-170000- /O.CON.KLOX.FW.W.0011.171217T1400Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 946 AM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 6 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... * Winds...Northeast winds are expected to peak late Saturday night into Sunday morning at 15 to 25 mph with gusts 35 to 45 mph. * Relative Humidity...Humidities above 15 percent will be possible late Saturday night, but are expected to lower to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ GOMBERG
083 WWUS86 KLOX 162118 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING IN EFFECT UNTIL 10 PM PST THIS EVENING FOR THE SANTA BARBARA COUNTY MOUNTAINS AND SOUTH COAST DUE TO GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES TONIGHT THROUGH SUNDAY EVENING... .DISCUSSION...Strong upper level winds behind the passage of an upper level disturbance combined with strengthening north-south pressure gradients caused a significant increase in winds across the Santa Barbara county mountains and south coast this morning, causing major impacts on the Thomas Fire. Wind gusts of 35 to 50 mph were common this morning across these areas, with isolated gusts up to 65 mph observed in the Montecito Hills. While humidities have modified somewhat today, the strong north to northeast winds through this evening will continue to maintain dangerous Red Flag conditions for the Santa Barbara county mountains and south coast. As a result of these strong winds, there will be very rapid fire spread, long range spotting, and extreme fire behavior observed at the Thomas Fire and any new fire ignitions. In addition, there will be gusty north winds across the Ventura county mountains today, especially near the Highway 33 and Interstate 5 corridors which will impact the Ventura county portion of the Thomas Fire. For the remainder of Ventura and Los Angeles Counties, the Santa Ana winds are expected to begin this evening, then peak overnight into Sunday when gusts between 35 and 55 mph will be likely. A Red Flag Warning is in effect for tonight through Sunday evening for much of Los Angeles and Ventura Counties. CAZ548-170530- /O.EXB.KLOX.FW.W.0010.171217T0500Z-171218T0400Z/ Los Angeles County San Gabriel Valley- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS OF THE SAN GABRIEL VALLEY... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty northeast winds and low relative humidity, which is in effect from 9 PM this evening to 8 PM PST Sunday. * Winds...Areas of northeast winds 15 to 25 mph with gusts to 35 mph in the foothills. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ246-253-254-170530- /O.EXT.KLOX.FW.W.0011.171217T0500Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING NOW IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast winds increasing this evening, peaking overnight into Sunday morning at 25 to 40 mph with gusts to 55 mph. Isolated gusts to 60 mph possible. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ244-245-288-170530- /O.EXT.KLOX.FW.W.0011.171217T0500Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING NOW IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... * Winds...Northeast winds are expected to increase this evening peaking overnight into Sunday morning at 20 to 30 mph with gusts to 50 mph. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ547-170530- /O.EXT.KLOX.FW.W.0011.171217T0500Z-171218T0400Z/ Los Angeles County San Fernando Valley- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING NOW IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...North to northeast winds are expected to increase this evening, peaking overnight into Sunday morning at 15 to 30 mph with gusts to 45 mph. Strongest winds northern and western portions. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ240-241-170530- /O.EXT.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING NOW IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... * Winds...North to northeast winds are expected to increase this evening peaking overnight into Sunday morning at 15 to 30 mph with gusts 35 to 45 mph. Strongest winds across the Ventura county coastal plain and Malibu to Hollywood Hills. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ252-170530- /O.CON.KLOX.FW.W.0010.000000T0000Z-171217T0600Z/ Santa Barbara County Mountains- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND ADJACENT FOOTHILLS... * Winds...Areas of north to northeast winds 20 to 35 mph with gusts to 55 mph in the mountains and adjacent foothills. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ239-170530- /O.CON.KLOX.FW.W.0010.000000T0000Z-171217T0600Z/ Santa Barbara County South Coast- 118 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... * Winds...Areas of north to northeast winds 15 to 30 mph with gusts to 45 mph below passes and canyons. Isolated gusts to 55 mph in the foothills. Strongest winds Santa Barbara eastward. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ GOMBERG
362 WWUS86 KLOX 170150 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING IN EFFECT UNTIL 10 PM PST THIS EVENING FOR THE SANTA BARBARA COUNTY MOUNTAINS AND SOUTH COAST DUE TO GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES TONIGHT THROUGH SUNDAY EVENING... .DISCUSSION...Strong upper level winds behind the passage of an upper level disturbance combined with strengthening north-south pressure gradients caused a significant increase in winds across the Santa Barbara county mountains and south coast this morning, causing major impacts on the Thomas Fire. Wind gusts of 35 to 50 mph were common this morning across these areas, with isolated gusts up to 65 mph observed in the Montecito Hills. While humidities have modified somewhat today, the strong north to northeast winds through this evening will continue to maintain dangerous Red Flag conditions for the Santa Barbara county mountains and south coast. As a result of these strong winds, there will be very rapid fire spread, long range spotting, and extreme fire behavior observed at the Thomas Fire and any new fire ignitions. In addition, there will be gusty north winds across the Ventura county mountains today, especially near the Highway 33 and Interstate 5 corridors which will impact the Ventura county portion of the Thomas Fire. For the remainder of Ventura and Los Angeles Counties, the Santa Ana winds are expected to begin this evening, then peak overnight into Sunday when gusts between 35 and 55 mph will be likely. A Red Flag Warning is in effect for tonight through Sunday evening for much of Los Angeles and Ventura Counties. CAZ246-253-254-170600- /O.CON.KLOX.FW.W.0011.171217T0500Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast winds increasing this evening, peaking overnight into Sunday morning at 25 to 40 mph with gusts to 55 mph. Isolated gusts to 60 mph possible. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ244-245-288-170600- /O.CON.KLOX.FW.W.0011.171217T0500Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... * Winds...Northeast winds are expected to increase this evening peaking overnight into Sunday morning at 20 to 30 mph with gusts to 50 mph. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ547-170600- /O.CON.KLOX.FW.W.0011.171217T0500Z-171218T0400Z/ Los Angeles County San Fernando Valley- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...North to northeast winds are expected to increase this evening, peaking overnight into Sunday morning at 15 to 30 mph with gusts to 45 mph. Strongest winds northern and western portions. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ252-170600- /O.CON.KLOX.FW.W.0010.000000T0000Z-171217T0600Z/ Santa Barbara County Mountains- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND ADJACENT FOOTHILLS... * Winds...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph in the mountains and adjacent foothills. Isolated gusts to 55 mph possible. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ240-241-170600- /O.CON.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... * Winds...North to northeast winds are expected to increase this evening peaking overnight into Sunday morning at 15 to 30 mph with gusts 35 to 45 mph. Strongest winds across the Ventura county coastal plain and Malibu to Hollywood Hills. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ239-170600- /O.CON.KLOX.FW.W.0010.000000T0000Z-171217T0600Z/ Santa Barbara County South Coast- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... * Winds...Areas of north to northeast winds 15 to 25 mph with gusts to 35 mph below passes and canyons. Isolated gusts to 45 mph in the foothills. Strongest winds Santa Barbara eastward. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ548-170600- /O.CON.KLOX.FW.W.0010.171217T0500Z-171218T0400Z/ Los Angeles County San Gabriel Valley- 550 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS OF THE SAN GABRIEL VALLEY... * Winds...Areas of northeast winds 15 to 25 mph with gusts to 35 mph in the foothills. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ Gomberg/Smith
720 WWUS86 KLOX 170556 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING IN EFFECT UNTIL 3 AM PST SUNDAY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND SOUTH COAST DUE TO GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY... ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES TONIGHT THROUGH SUNDAY EVENING... .DISCUSSION...Strong upper level winds behind the passage of an upper level disturbance combined with strengthening north-south pressure gradients caused a significant increase in winds across the Santa Barbara county mountains and south coast this morning, causing major impacts on the Thomas Fire. Wind gusts of 35 to 45 mph continue to linger across the area. While humidities have modified somewhat earlier and this evening, the strong north to northeast winds will continue to maintain dangerous Red Flag conditions for the Santa Barbara County Mountains and South Coast through late tonight. As a result of these strong winds, there will be very rapid fire spread, long range spotting, and extreme fire behavior observed at the Thomas Fire and any new fire ignitions. In addition, there will be gusty north winds across the Ventura county mountains today, especially near the Highway 33 and Interstate 5 corridors which will impact the Ventura county portion of the Thomas Fire. For the remainder of Ventura and Los Angeles Counties, the Santa Ana winds are expected to begin this evening, then peak overnight into Sunday when gusts between 35 and 55 mph will be likely. A Red Flag Warning is in effect for tonight through Sunday evening for much of Los Angeles and Ventura Counties. CAZ252-171100- /O.EXT.KLOX.FW.W.0010.000000T0000Z-171217T1100Z/ Santa Barbara County Mountains- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING NOW IN EFFECT UNTIL 3 AM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS AND ADJACENT FOOTHILLS... * Winds...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph in the mountains and adjacent foothills. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ239-171100- /O.EXT.KLOX.FW.W.0010.000000T0000Z-171217T1100Z/ Santa Barbara County South Coast- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING NOW IN EFFECT UNTIL 3 AM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA SOUTH COAST AND ADJACENT FOOTHILLS... * Winds...Areas of north to northeast winds 15 to 25 mph with gusts to 35 mph below passes and canyons. Isolated gusts to 45 mph in the foothills. Strongest winds Santa Barbara eastward. * Relative Humidity...Minimum values 15 to 25 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. This is a dangerous situation, please follow evacuation orders. && $$ CAZ246-253-254-171400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast winds will increase to 25 to 40 mph with gusts to 55 mph and continue into Sunday morning. Isolated gusts to 60 mph possible. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ244-245-288-171400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... * Winds...Northeast winds will increase to 20 to 30 mph with gusts to 50 mph and continue Sunday morning. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ547-171400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Los Angeles County San Fernando Valley- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST SUNDAY FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...North to northeast winds will increase to 15 to 30 mph with gusts to 45 mph and continue into Sunday morning. Strongest winds northern and western portions. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ240-241-171400- /O.CON.KLOX.FW.W.0011.171217T0900Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM TO 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... * Winds...North to northeast winds will increase to 15 to 30 mph with gusts 35 to 45 mph and continue into Sunday morning. Strongest winds across the Ventura county coastal plain and Malibu to Hollywood Hills. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ548-171400- /O.CON.KLOX.FW.W.0010.000000T0000Z-171218T0400Z/ Los Angeles County San Gabriel Valley- 956 PM PST Sat Dec 16 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST SUNDAY FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS OF THE SAN GABRIEL VALLEY... * Winds...Areas of northeast winds 15 to 25 mph with gusts to 35 mph in the foothills. * Relative Humidity...Humidities 15 to 25 percent tonight, lowering to 10 to 15 percent on Sunday. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ Hall
743 WWUS86 KLOX 171123 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES THROUGH THIS EVENING... .DISCUSSION...The winds have significantly subsided across Santa Barbara county and western Ventura county. For the remainder of Ventura and Los Angeles Counties, the Santa Ana winds are expected to begin this evening, then peak overnight into Sunday when gusts between 35 and 55 mph will be likely. A Red Flag Warning is in effect for tonight through Sunday evening for much of Los Angeles and Ventura Counties. CAZ239-252-171230- /O.EXP.KLOX.FW.W.0010.000000T0000Z-171217T1100Z/ Santa Barbara County South Coast-Santa Barbara County Mountains- 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR Santa Barbara county and western Ventura county... The winds have significantly subsided and will not return through at least Wednesday Evening. Minimum values will range from 15 to 25 percent. $$ CAZ246-253-254-171930- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast winds 25 to 40 mph with gusts to 60 mph will continue into the afternoon. * Relative Humidity...Humidities will lower to 10 to 15 percent today. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ244-245-288-171930- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... * Winds...Northeast winds from 20 to 30 mph with gusts to 50 mph will continue into the afternoon. * Relative Humidity...Humidities will fall from 15 to 25 percent early this morning to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ547-171930- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Los Angeles County San Fernando Valley- 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...North to northeast winds 15 to 30 mph with gusts to 45 mph will continue into the afternoon. Strongest winds northern and western portions. * Relative Humidity...Humidities 15 to 25 percent early this morning will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ240-241-171930- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... * Winds...North to northeast winds 15 to 30 mph with gusts 35 to 45 mph will continue into the afternoon. Strongest winds across the Ventura county coastal plain and Malibu to Hollywood Hills. * Relative Humidity...Humidities 15 to 25 percent early this morning will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ548-171930- /O.CON.KLOX.FW.W.0010.000000T0000Z-171218T0400Z/ Los Angeles County San Gabriel Valley- 323 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS OF THE SAN GABRIEL VALLEY... * Winds...Areas of northeast winds 15 to 25 mph with gusts to 35 mph in the foothills. * Relative Humidity...Humidities 15 to 25 percent early this morning will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of gusty winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ ASR
088 WWUS86 KLOX 171801 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1001 AM PST Sun Dec 17 2017 ...RED FLAG WARNING IN EFFECT FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES UNTIL 8 PM THIS EVENING DUE TO STRONG SANTA ANA WINDS AND LOW HUMIDITIES... .DISCUSSION... A moderate to strong Santa Ana wind event is impacting Ventura and Los Angeles counties today, with alignment of the offshore pressure gradient, upper level wind support, and cold air advection. Critical Red Flag conditions can be expected for much of Los Angeles and Ventura counties through 8 pm this evening. The strongest winds are expected to occur this morning through early afternoon, with damaging wind gusts of 60 to 70 mph across the mountains (including the Santa Monicas), and gusts 40 to 55 mph across coastal and valley areas. These powerful Santa Ana winds will bring considerable blowing dust and ash across the area from recent fire activity. In addition, very rapid fire spread, long range spotting, and extreme fire behavior will occur on the Ventura county portion of the Thomas Fire and any new ignitions today. CAZ246-253-254-180400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 1001 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast winds 30 to 45 mph with damaging gusts 60 to 70 mph today will diminish to 15 to 30 mph with gusts to 40 mph by this evening. * Relative Humidity...Humidities will lower to 10 to 20 percent today. * Impacts...There will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and very dry fuels can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ244-245-288-180400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 1001 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... * Winds...Northeast winds from 20 to 35 mph with gusts 45 to 55 mph today will diminish to 15 to 25 mph with gusts to 30 mph by this evening. * Relative Humidity...Humidities will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and very dry fuels can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ547-180400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Los Angeles County San Fernando Valley- 1001 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...North to northeast winds 20 to 35 mph with gusts to 50 mph today will diminish to 10 to 20 mph with gusts to 25 mph by this evening. Strongest winds northern and western portions. * Relative Humidity...Humidities will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ240-241-180400- /O.CON.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 1001 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... * Winds...North to northeast winds 20 to 35 mph with gusts 40 to 50 mph today will diminish to 10 to 20 mph with gusts to 30 mph by this evening. Strongest winds across the Ventura county coastal plain and Malibu to Hollywood Hills. * Relative Humidity...Humidities will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of strong winds...low relative humidity...and very dry fuels can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ CAZ548-180400- /O.CON.KLOX.FW.W.0010.000000T0000Z-171218T0400Z/ Los Angeles County San Gabriel Valley- 1001 AM PST Sun Dec 17 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS OF THE SAN GABRIEL VALLEY... * Winds...Areas of northeast winds 15 to 25 mph with gusts to 35 mph in the foothills. * Relative Humidity...Humidities will lower to 10 to 15 percent. * Impacts...If fire ignition occurs, there will be the potential for very rapid spread of wildfire, long range spotting, and extreme fire behavior that could lead to a threat to life and property. Use extreme caution with potential fire ignition sources. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are occurring. A combination of gusty winds...low relative humidity...and very dry fuels can contribute to extreme fire behavior. Use extreme caution when using potential fire ignition sources. && $$ Gomberg
673 WWUS86 KLOX 180354 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 754 PM PST Sun Dec 17 2017 CAZ246-253-254-180500- /O.EXP.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 754 PM PST Sun Dec 17 2017 ...RED FLAG WARNING WILL EXPIRE AT 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... Gusty northeast winds will continue across portions of Ventura and Los Angeles Counties, but most areas will see improving fire weather conditions through Monday morning. $$ CAZ244-245-288-180500- /O.EXP.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Interior Valleys-Ventura County Coastal Valleys- Santa Clarita Valley- 754 PM PST Sun Dec 17 2017 ...RED FLAG WARNING WILL EXPIRE AT 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COUNTY VALLEYS AND SANTA CLARITA VALLEY... Gusty northeast winds will continue across portions of Ventura and Los Angeles Counties, but most areas will see improving fire weather conditions through Monday morning. $$ CAZ547-180500- /O.EXP.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Los Angeles County San Fernando Valley- 754 PM PST Sun Dec 17 2017 ...RED FLAG WARNING WILL EXPIRE AT 8 PM PST THIS EVENING FOR GUSTY NORTH TO NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... Gusty northeast winds will continue across portions of Ventura and Los Angeles Counties, but most areas will see improving fire weather conditions through Monday morning. $$ CAZ240-241-180500- /O.EXP.KLOX.FW.W.0011.000000T0000Z-171218T0400Z/ Ventura County Coast- Los Angeles County Coast including Downtown Los Angeles- 754 PM PST Sun Dec 17 2017 ...RED FLAG WARNING WILL EXPIRE AT 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE VENTURA COAST AND LOS ANGELES COAST FROM MALIBU TO HOLLYWOOD HILLS... Northeast winds are diminishing across coastal areas of Los Angeles and Ventura Counties, with improving fire weather conditions. $$ CAZ548-180500- /O.EXP.KLOX.FW.W.0010.000000T0000Z-171218T0400Z/ Los Angeles County San Gabriel Valley- 754 PM PST Sun Dec 17 2017 ...RED FLAG WARNING WILL EXPIRE AT 8 PM PST THIS EVENING FOR GUSTY NORTHEAST WINDS AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS OF THE SAN GABRIEL VALLEY... Northeast winds are diminishing across coastal areas of Los Angeles and Ventura Counties, with improving fire weather conditions. $$ Smith
What forecasters said that day
The local office's own words before this red flag warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Los Angeles, CA wrote its last area forecast discussion before this red flag warning went out at Dec 15, 10:44 AM PST, 3 hours 13 minutes earlier.
Area forecast discussion, Dec 15, 10:44 AM PST, 3 hours 13 minutes before
Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
1044 AM PST Fri Dec 15 2017
.SYNOPSIS...
Very dry and warm conditions will persist today. Some cooling is
expected this weekend as a trough moves through the region. Northerly
winds will return on Saturday, turning into another Santa Ana
wind event late Saturday night into Sunday. Gradual warming early
next week with weaker offshore winds expected.
&&
.SHORT TERM...(TDY-SUN)
Forecast on track today, with similarly warm conditions compared
to yesterday and mostly light winds during the day as we quickly
turn from offshore flow to light onshore. This light wind regime
will allow smoke from the Thomas fire to become more concentrated
and spread more into Ventura and possibly west Los Angeles County.
Updated the forecast to better reflect that. Northerly winds for
tonight into Saturday are still on target to strengthen, including
Sundowner winds over Santa Barbara County and the Thomas Fire.
These winds should stay just below wind advisory however.
***From Previous Discussion***
Synoptically, An upper level disturbance will ride down the
eastern side of the Eastern pac upper ridge through California
tonight into Saturday. Earlier models had this shortwave becoming
cutoff across the southern SoCal Bight early Saturday morning, but
the GFS, ECMWF and the high resolution NAM-WRF now quickly move
this digging trough towards San Diego or Baja before it becomes
cutoff Saturday morning into So Arizona. Areas to the south will
have the best chance of seeing a few showers develop, or off the
coastal waters of Orange County and San Diego. But this is still a
slight chance. With the height falls, clouds should develop
tonight across LA and VTU Counties then clear out by Saturday
afternoon.
The main story for Saturday will be the northerly winds
developing behind the frontal passage. Sundowner winds are
expected to develop by late tonight into Saturday morning. By late
Saturday into Sunday the pattern shifts to a Santa Ana. For
Ventura/LA Counties north to northeast winds will start up during
the day Saturday and increase overnight and peaking Sunday morning
with solid advisory level winds and possibly local gusts to 60
mph in the mountains as good upper support and cold air advection
will enhance this wind event Sunday. The additional cold air
coming in Saturday night and Sunday will more than offset any
warming from the downslope flow so highs at lower elevations
expected to top out in the lower 70s.
.LONG TERM...(MON-THU)
Both the GFS and ECMWF remain in good agreement with large scale
features through the Thursday. Offshore winds will be rather weak
both Monday and Tuesday with a gradual warming trend. By
Wednesday, another upper level trough begins to drop out of the
PAC NW and become an inside slider as it moves into the Great
Basin on Thursday. Both models then retrograde the upper low
towards northern Baja by Thursday night. By Wednesday night into
Thursday morning, northerly winds develop affecting the Santa
Barbara Mtns and adjacent south coast as well as the I-5 Corridor,
then turn offshore into another Santa Ana event. The placement of
the upper low over nrn Baja and more cold air advection could
bring another strong Santa Ana Wind event. OF course, this
scenario is still several days away, and models can flip-flop like
your buttermilk pancakes, so stay tuned.
&&
.AVIATION...15/1755Z...
At 1709Z, there was a weak surface-based inversion at KLAX. The top
of the inversion was near 1100 ft with a temperature of 22 deg C.
Generally hi confidence in the 18Z TAFs. VFR conditions are expected
at most of the airfields thru Sat morning. However, there is a 10-20
percent chance low clouds may move into KLAX or KLGB Sat morning
with LIFR/IFR cigs. For KSBA, CMA and OXR, there is a 40-50 percent
chance that smoke from the Thomas Fire may reduce vsbys to MVFR at
times thru Sat morning. Low level wind shear will be possible at
KSBA aft 12Z Sat due to gusty N canyon winds in the vicinity.
KLAX...Generally hi confidence in the 18Z TAF with VFR conditions
expected thru Sat afternoon. However, there is a 10-20 percent
chance low clouds may move into the airfield Sat morning with
LIFR/IFR cigs.
KBUR...Hi confidence in the 18Z TAF with VFR conditions expected
thru Sat morning.
&&
.MARINE...15/830 AM.
Across the outer waters, fairly good confidence that NW winds
will increase to SCA levels this evening, then to gale force
conditions by late tonight. There is a 30% chance that seas will
build to SCA levels as early as this afternoon, at least across
the northern two thirds of the outer waters. Gale force winds
will continue through late Sat night, then SCA conds will continue
for a few hours thereafter. Seas will possibly remain above SCA
thresholds for hazardous seas through around noon Sunday.
Across the inner waters north of Point Sal, moderate to high
confidence that winds and seas will reach SCA level winds
from late tonight and continue through late Saturday night. There
is a 20-30% chance that SCA conds will arrive before midnight
tonight.
Across the inner Waters south of Point Conception, winds and seas
are expected to be below SCA levels through Tue, except for a
40-50% chance of SCA level NE winds late Sat night into Sun
morning from Ventura to Anacapa Island south to Santa Monica,
and possibly from San Pedro to Catalina Island.
There will be areas of smoke from the Thomas fire over portions
of the coastal waters today, mainly from the waters west of
Ventura County through the Santa Barbara Channel and over the
outer waters. Visibilities could locally drop to 2 NM or
lower at times today.
&&
.FIRE WEATHER...15/1030 AM.
Red Flag Warnings allowed to expire this morning for Los Angeles
and Ventura counties. Red Flag Warning in effect from 2 am to
10 pm Saturday for the Santa Barbara County Mountains and adjacent
foothills. Fire Weather Watch in effect from late Saturday night
through Sunday evening for the Los Angeles and Ventura county
mountains and valleys.
Offshore winds continue to weaken this morning allowing
for the expiration of the Red Flag Warnings for Los Angeles and
Ventura counties. Onshore winds will overspread most coastal
and valley areas this afternoon and evening. There is expected
to be some improvements in humidity along the coast, but will
remain very dry across inland areas.
After the passage of an upper level disturbance, there will be
increasing upper level wind support and cold air advection that will
bring strengthening north to northeast winds across the mountains
and adjacent foothills of Santa Barbara county (including higher
elevations of the Thomas Fire) late tonight through Saturday evening,
with gusts of 30 to 40 mph being common. Due to the stronger winds
in the upper atmosphere, there is the potential for locally stronger
gusts across exposed ridgetops on Saturday. The combination of these
gusty winds with humidities generally ranging between 10 and 20 percent
will likely result in critical Red Flag conditions across the Santa
Barbara county mountains. As a result, there will be an increased
threat of very rapid fire spread, long range spotting, and extreme
fire behavior. Gusty north to northeast winds up to 30 mph will
also filter down into the Santa Barbara south coast, which could
bring significant impacts to lower elevations of the Thomas Fire.
In addition, there will be increasing northerly winds on Saturday
across the Ventura county mountains, especially near the Highway
33 and Interstate 5 corridors.
For the remainder of Ventura and Los Angeles counties, the flow will
likely shift to the northeast by Saturday evening, with a greater
threat of increased Santa Ana winds and low humidities late
Saturday night into Sunday when gusts between 35 and 55 mph will
be possible. A Fire Weather Watch is in effect for late Saturday
night through Sunday evening for the mountains and valleys of Los
Angeles and Ventura counties, with critical conditions possibly
extending to coastal areas. This upcoming Santa Ana wind event
has upper level wind support, cold air advection, and a fairly
strong offshore pressure gradient (projected to be around -7 mb
for LAX-Daggett on Sunday morning). An additional Santa Ana wind
event is possible next Thursday into Friday.
Those near current wildfires need to stay aware of and follow
official evacuation orders. Everyone needs to exercise extreme
caution when handling any potential fire ignition sources...such
as campfires, cigarettes, welding and brush clearing equipment.
&&
.LOX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Advisory in effect until 9 AM PST Sunday for zones
34-35. (See LAXCFWLOX).
Fire Weather Watch in effect from late Saturday night through
Sunday evening for zones 244>246-253-254-288-547. (See LAXRFWLOX).
Red Flag Warning in effect from 2 AM to 10 PM PST Saturday
for zone 252. (See LAXRFWLOX).
PZ...Small Craft Advisory in effect from 3 AM Saturday to 3 AM PST
Sunday for zone 645. (See LAXMWWLOX).
Small Craft Advisory in effect from 9 PM this evening to 3 AM
PST Saturday for zones 670-673-676. (See LAXMWWLOX).
Gale Warning in effect from 3 AM Saturday to 3 AM PST Sunday
for zones 670-673-676. (See LAXMWWLOX).
&&
.HAZARD POTENTIAL OUTLOOK...(SUN-THU)
Critical fire weather conditions possible Sunday with gusty north
to northeast winds and very low humidities. Gusty offshore winds
and critical fire weather conditions possible starting Thursday.
&&
PUBLIC...Kittell/Kaplan
AVIATION...Sirard
MARINE...DB/Sirard
FIRE...Gomberg
SYNOPSIS...Kaplan/RK
weather.gov/losangelesThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 3:14 AM PST | Gale Warning | LOX | 41 hr | |
| Dec 15, 3:14 AM PST | Small Craft Advisory | LOX | 72 hr | |
| Dec 15, 3:52 AM PST | High Surf Advisory | LOX | 53 hr | |
| Dec 15, 9:51 AM PST | Red Flag Warning | LOX | Los Angeles | 58 hr |
Nearby
Red Flag Warnings in California, 2017Every red flag warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.