Alert archive / California / Red Flag Warnings in 2019
Red Flag Warning 4, NWS Los Angeles, CA
NWS Los Angeles, CA issued this red flag warning at Oct 22, 2019, 2:32 PM PDT for Los Angeles County, California. It took effect at Oct 24, 2019, 1:00 AM PDT. It was in force for 45 hr. 6 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
- Oct 22, 2019, 2:32 PM PDT (21:32 UTC)
- In effect from
- Oct 24, 2019, 1:00 AM PDT
- Expired
- Oct 25, 2019, 10:00 PM PDT
- In force
- 45 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 21:30 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 |
|---|---|---|---|
| Oct 24, 7:38 AM PDT | HIGH SUST WINDS 42 | 2 Ne San Fernando, CA | MESONET STATION EW8724 SYLMAR. |
| Oct 24, 9:53 AM PDT | HIGH SUST WINDS 40 | 8 Ese Castaic Lake, CA | NORTHEAST WINDS 40 MPH GUSTING TO 53 MPH, ELEVATION 4930 FEET. |
| Oct 24, 1:49 PM PDT | WILDFIRE | 9 Ene Santa Clarita, CA | REPORTED AT 31600 TICK CANYON RD. |
| Oct 24, 3:14 PM PDT | WILDFIRE | 4 Nne Val Verde, CA | CORRECTS PREVIOUS WILDFIRE REPORT FROM 4 NNE VAL VERDE. WILDFIRE STARTING NEAR THE OLD RD AND LAKE HUGHES RD. |
| Oct 24, 3:29 PM PDT | WILDFIRE | 4 Nne Val Verde, CA | WILDFIRE STARTING NEAR THE OLD RD AND LAKE HUGHES RD. |
| Oct 24, 5:50 PM PDT | HIGH SUST WINDS 43 | 8 Nw Acton, CA | MESONET STATION SE444 SIERRA PELONA WEST (SCE). |
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, 9.5 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
- 4213 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
252 WWUS86 KLOX 222132 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 232 PM PDT Tue Oct 22 2019 ...RED FLAG WARNING IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH FRIDAY EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... .A Santa Ana wind event will bring widespread critical conditions to most of Los Angeles and Ventura Counties. There is still some uncertainty in the strength of the winds, but peak gusts between 45 and 65 mph is the most likely outcome. Minimum humidities will likely lower well below 10 percent, with maximum temperatures between 87 and 97. This is a dangerous situation with an environment ripe for large and fast fire growth, and a Red Flag Warning is in effect as a result. CAZ240-244>246-253-254-288-547-231800- /O.UPG.KLOX.FW.A.0004.191024T1000Z-191026T0500Z/ /O.NEW.KLOX.FW.W.0004.191024T0800Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 232 PM PDT Tue Oct 22 2019 ...RED FLAG WARNING IN EFFECT FROM 1 AM THURSDAY TO 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 1 AM Thursday to 10 PM PDT Friday. The previous Fire Weather Watch has been replaced by this warning. * Winds...Northeast 20 to 40 mph with gusts up to 65 mph. Strongest in the mountains and hills. * Relative Humidity...As low as 2 to 5 percent. Very poor overnight recoveries. * Temperature...As high as 87 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ CAZ241-548-231800- /O.UPG.KLOX.FW.A.0004.191024T1000Z-191026T0500Z/ /O.NEW.KLOX.FW.W.0004.191024T0800Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 232 PM PDT Tue Oct 22 2019 ...RED FLAG WARNING IN EFFECT FROM 1 AM THURSDAY TO 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 1 AM Thursday to 10 PM PDT Friday. The previous Fire Weather Watch has been replaced by this warning. * Winds...Northeast 20 to 30 mph with gusts to 50 mph in the canyons and hills. * Relative Humidity...As low as 2 to 9 percent. Very poor overnight recoveries. * Temperature...As high as 92 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$
7 follow-up statements
485 WWUS86 KLOX 231616 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 916 AM PDT Wed Oct 23 2019 ...RED FLAG WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... .A Santa Ana wind event will bring widespread critical conditions to most of Los Angeles and Ventura Counties. Peak wind gusts between 45 and 65 mph are expected. Minimum humidities will likely lower well below 10 percent, with maximum temperatures between 87 and 97. This is a dangerous situation with an environment ripe for large and fast fire growth, and a Red Flag Warning is in effect as a result. CAZ240-244>246-253-254-288-547-240030- /O.CON.KLOX.FW.W.0004.191024T0800Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 916 AM PDT Wed Oct 23 2019 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM THURSDAY TO 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast 20 to 40 mph with gusts up to 65 mph. Strongest in the mountains and hills. * Relative Humidity...As low as 2 to 5 percent. Very poor overnight recoveries. * Temperature...As high as 87 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ CAZ241-548-240030- /O.CON.KLOX.FW.W.0004.191024T0800Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 916 AM PDT Wed Oct 23 2019 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM THURSDAY TO 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... * Winds...Northeast 20 to 30 mph with gusts to 50 mph in the hills and canyons. * Relative Humidity...As low as 2 to 9 percent. Very poor overnight recoveries. * Temperature...As high as 92 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ Kittell
371 WWUS86 KLOX 232234 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 334 PM PDT Wed Oct 23 2019 ...RED FLAG WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... .A Santa Ana wind event will bring widespread critical conditions to most of Los Angeles and Ventura Counties. Peak wind gusts between 45 and 65 mph are expected. Minimum humidities will likely lower well below 10 percent, with maximum temperatures between 87 and 97. This is a dangerous situation with an environment ripe for large and fast fire growth, and a Red Flag Warning is in effect as a result. CAZ240-244>246-253-254-288-547-241800- /O.CON.KLOX.FW.W.0004.191024T0800Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 334 PM PDT Wed Oct 23 2019 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM THURSDAY TO 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast 20 to 40 mph with gusts up to 65 mph. Strongest in the mountains and hills. * Relative Humidity...As low as 2 to 5 percent. Very poor overnight recoveries. * Temperature...As high as 87 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ CAZ241-548-241800- /O.CON.KLOX.FW.W.0004.191024T0800Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 334 PM PDT Wed Oct 23 2019 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM THURSDAY TO 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... * Winds...Northeast 20 to 30 mph with gusts to 50 mph in the hills and canyons. * Relative Humidity...As low as 2 to 9 percent. Very poor overnight recoveries. * Temperature...As high as 92 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ Kittell
807 WWUS86 KLOX 241550 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 850 AM PDT Thu Oct 24 2019 ...RED FLAG WARNING IN EFFECT THROUGH FRIDAY EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... .An extreme Santa Ana wind event will bring widespread critical conditions to most of Los Angeles and Ventura Counties. Peak wind gusts between 50 and 70 mph are expected. Minimum humidities will lower well below 10 percent, with maximum temperatures between 87 and 97. This is a dangerous situation with an environment ripe for large and fast fire growth, and a Red Flag Warning is in effect as a result. CAZ240-244>246-253-254-288-547-250000- /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 850 AM PDT Thu Oct 24 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast 25 to 40 mph with gusts up to 60 mph. Isolated gusts to 70 mph in the mountains and hills. * Relative Humidity...As low as 2 to 5 percent. Very poor overnight recoveries. * Temperature...As high as 87 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ CAZ241-548-250000- /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 850 AM PDT Thu Oct 24 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... * Winds...Northeast 20 to 30 mph with gusts to 50 mph in the hills and canyons. * Relative Humidity...As low as 2 to 9 percent. Very poor overnight recoveries. * Temperature...As high as 92 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$
000 WWUS86 KLOX 242139 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 239 PM PDT Thu Oct 24 2019 ...RED FLAG WARNING IN EFFECT THROUGH FRIDAY EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... .A Santa Ana wind event will bring widespread critical conditions to most of Los Angeles and Ventura Counties. Peak wind gusts between 40 and 60 mph with isolated gusts to 70 mph are expected. Minimum humidities will lower well below 10 percent, with maximum temperatures between 87 and 97. This is a dangerous situation with an environment ripe for large and fast fire growth, and a Red Flag Warning is in effect as a result. CAZ240-244>246-253-254-288-547-251815- /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 239 PM PDT Thu Oct 24 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast 25 to 40 mph with gusts up to 60 mph. Isolated gusts to 70 mph in the mountains and hills. * Relative Humidity...As low as 2 to 5 percent. Very poor overnight recoveries. * Temperature...As high as 87 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ CAZ241-548-251815- /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 239 PM PDT Thu Oct 24 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... * Winds...Northeast 20 to 30 mph with gusts to 50 mph in the hills and canyons. * Relative Humidity...As low as 2 to 9 percent. Very poor overnight recoveries. * Temperature...As high as 92 to 97 degrees. Warmest on Friday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ KITTELL/DELERME
989 WWUS86 KLOX 251610 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 910 AM PDT Fri Oct 25 2019 ...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... .A Santa Ana wind event will continue to bring critical conditions to most of Los Angeles and Ventura Counties. Peak wind gusts between 30 and 50 mph will continue this morning, then weaken into the evening hours. Minimum humidities will remain well below 10 percent, with maximum temperatures between 87 and 97. This is a dangerous situation with an environment ripe for large and fast fire growth. Critical conditions will likely end this afternoon or evening, and there are no plans to extend the Red Flag Warning at this point. There is a chance for additional critical conditions Sunday afternoon through Monday afternoon. CAZ240-244>246-253-254-288-547-260500- /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 910 AM PDT Fri Oct 25 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Northeast 20 to 30 mph with gusts to 50 mph, becoming 10 to 20 mph with gusts to 30 mph by the evening. * Relative Humidity...As low as 2 to 5 percent. * Temperature...As high as 87 to 97 degrees. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ CAZ241-548-260500- /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 910 AM PDT Fri Oct 25 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... * Winds...East to northeast 10 to 30 mph with gusts to 30 mph in the hills and canyons. * Relative Humidity...As low as 2 to 9 percent. * Temperature...As high as 92 to 97 degrees. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. && $$ Kittell
050 WWUS86 KLOX 252136 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 236 PM PDT Fri Oct 25 2019 ...RED FLAG WARNING THROUGH THIS EVENING OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR MODERATE SANTA ANA WINDS AND VERY LOW RELATIVE HUMIDITY... ...FIRE WEATHER WATCH SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR POSSIBLE SANTA ANA WINDS AND LOW RELATIVE HUMIDITY... .Gusty northeast winds will decrease into the evening hours, but conditions will remain very dry through Saturday. However, there are no plans to extend the Red Flag Warning. Another Santa Ana wind event is likely Sunday and Monday. Peak winds between 20 to 30 mph with gusts to 50 mph focused across Los Angeles and Ventura Counties are possible, but there is a lot of uncertainty. Humidities will increase Saturday night into Sunday, but decrease down to critical levels by Monday. This may result in another period of critical fire weather conditions, which led to the issuance of a Fire Weather Watch for most of Los Angeles and Ventura Counties. The Los Angeles Coast and San Gabriel Valley has a later start time due to the likely presence of a marine layer on Sunday. CAZ240-244>246-253-254-288-547-261800- /O.NEW.KLOX.FW.A.0005.191027T2100Z-191029T0100Z/ /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 236 PM PDT Fri Oct 25 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... ...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... The National Weather Service in Los Angeles/Oxnard has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Sunday afternoon through Monday afternoon. * Winds...Northeast 10 to 25 mph with gusts to 35 mph into this evening. Northeast 20 to 30 mph with gusts to 50 mph possible Sunday night through Monday. * Relative Humidity...As low as 2 to 5 percent into this evening, then 5 to 10 percent Sunday night through Monday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ CAZ241-548-261800- /O.NEW.KLOX.FW.A.0005.191028T0600Z-191029T0100Z/ /O.CON.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 236 PM PDT Fri Oct 25 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... ...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... The National Weather Service in Los Angeles/Oxnard has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Sunday evening through Monday afternoon. * Winds...In the Hills and Canyons, Northeast 8 to 15 mph with gusts to 25 into this evening. Northeast winds 15 to 25 mph with gusts to 40 mph possible Sunday night and Monday. * Relative Humidity...As low as 2 to 9 percent into this evening, and 5 to 10 percent Sunday night and Monday. * Impacts...If fire ignition occurs, conditions will be for favorable extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Use extreme caution with potential fire ignition sources. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$
100 WWUS86 KLOX 260507 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1007 PM PDT Fri Oct 25 2019 ...RED FLAG WARNING HAS EXPIRED... ...FIRE WEATHER WATCH SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON OVER MOST OF LOS ANGELES AND VENTURA COUNTIES FOR POSSIBLE SANTA ANA WINDS AND LOW RELATIVE HUMIDITY... .Red flag conditions have ended across the area this evening. Another Santa Ana wind event is likely Sunday and Monday. Peak winds between 20 to 30 mph with gusts to 50 mph focused across Los Angeles and Ventura Counties are possible, but there is a lot of uncertainty. Humidities will increase Saturday night into Sunday, but decrease down to critical levels by Monday. This may result in another period of critical fire weather conditions. Due to this possibility...a Fire Weather Watch continues for most of Los Angeles and Ventura Counties. The Los Angeles Coast and San Gabriel Valley has a later start time due to the likely presence of a marine layer on Sunday. CAZ240-244>246-253-254-288-547-261315- /O.EXP.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ /O.CON.KLOX.FW.A.0005.191027T2100Z-191029T0100Z/ Ventura County Coast-Ventura County Interior Valleys- Ventura County Coastal Valleys- Santa Monica Mountains Recreational Area- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 1007 PM PDT Fri Oct 25 2019 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... ...RED FLAG WARNING HAS EXPIRED FOR ALL AREAS .... * Winds...Northeast 20 to 30 mph with gusts to 50 mph possible Sunday night through Monday. * Relative Humidity...As low as 5 to 10 percent Sunday night through Monday. * Impacts...If fire ignition occurs, conditions will be favorable for extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ CAZ241-548-261315- /O.EXP.KLOX.FW.W.0004.000000T0000Z-191026T0500Z/ /O.CON.KLOX.FW.A.0005.191028T0600Z-191029T0100Z/ Los Angeles County Coast including Downtown Los Angeles- Los Angeles County San Gabriel Valley- 1007 PM PDT Fri Oct 25 2019 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HILLS AND CANYONS OF THE LOS ANGELES COAST AND SAN GABRIEL VALLEY... ...RED FLAG WARNING HAS EXPIRED... * Winds...In the Hills and Canyons Sunday night and Monday, northeast winds 15 to 25 mph with gusts to 40 mph possible . * Relative Humidity...As low as 5 to 10 percent Sunday night and Monday. * Impacts...If fire ignition occurs, conditions will be for favorable extreme fire behavior and rapid growth which would threaten life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ ASR
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 Oct 22, 2:07 PM PDT, 25 minutes earlier.
Area forecast discussion, Oct 22, 2:07 PM PDT, 25 minutes before
Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
207 PM PDT Tue Oct 22 2019
.SYNOPSIS...22/119 PM.
Hot and dry conditions will continue across most of the region,
accompanied by weak to locally moderate Santa Ana winds affecting
portions of Ventura and Los Angeles today. Temperatures will
slightly cool off on Wednesday before a stronger Santa Ana wind
event develops Thursday into Friday. Cooler conditions will
return going into the weekend.
&&
.SHORT TERM (TDY-FRI)...22/148 PM.
Very hot and dry today but generally much lighter winds as we are
in between Santa Ana events. Onshore trends have been slow to
develop today allowing temps to warm up in many areas over
yesterday. It will be hot again tomorrow but likely a few degrees
cooler as the sea breeze should start earlier than today.
Offshore flow expected to get another shot in the arm Wednesday
night and Thursday as the next trough swings south out of Canada
and into the northern Rockies and Great Basin. The GFS (including
most of its ensemble members) continues to indicate a light
offshore event at best while the ECMWF and NAM both are suggesting
a strong Santa Ana, possibly the strongest of the season so far
LAX-DAG gradients in excess of -8mb and 50-60kt of wind between
the surface and 850mb. The absence of cold air advection is
concerning and this isn't a slam dunk event yet, but the ECMWF did
a better job with the last event and it's been consistent the last
few days with this one, even getting stronger. Because of this,
confidence is high enough now to go with a high wind watch for the
LA/Ventura valleys and mountains, including the Santa Monica's but
not the San Gabriel Valley. Could make a case for a watch for the
interior portion of the Ventura Coast in the Camarillo area but
it's rare to get warning level gusts especially without the cold
air advection. But certainly gusts to 50 are a reasonable
expectation and same with the Malibu coast.
This will be another hot event as the eastern Pacific Ridge
expands east following the trough passage with 500mb heights
approaching 590dm. After a little cool down tomorrow look for
highs to jump again Thu and Fri with 90s again commonplace across
coast/valleys. Would not be surprised if heat advisories are again
needed. Could even make a case for an excessive heat warning for
some of the coastal areas which will be 20+ degrees above normal.
Overnight lows will be very warm as well, especially in windy
areas. Case in point, the low this morning in Morro Bay was 73
degrees thanks to a steady northeast wind. Could be looking at
more of the same later this week.
.LONG TERM (SAT-TUE)...22/203 PM.
The ridge will start to break down over the weekend as another
trough approaches from the north. Gradients will also be trending
strongly onshore so look for significant cooling as early as
Saturday and continuing Sunday. May even start to see some marine
layer clouds returning to southern coastal areas by Sunday with
temps back to near normal in most areas.
Forecast confidence drops after Sunday as there are big
differences in handling of the next trough early next week. The
deterministic 12z ECMWF run went back to a sharply cutting upper
trough with almost 50dm of height change from the previous run
over California. The ensemble mean is weaker but still much colder
than the GFS ensemble mean. Still seems too unlikely for rain in
our area to include in the official forecast but not a zero
chance. More likely we'll see another bump up in offshore winds
early next week but with cooler temps than what we've seen.
Current forecast leans towards the GFS next week given the better
consistency with it but definitely low confidence.
&&
.AVIATION...22/1648Z.
At 1557Z, there was no marine layer at KLAX.
High confidence with CAVU conditions in the current forecast. Periods
of moderate UDDF and LLWS are possible at all terminals across
L.A. and Ventura Counties.
KLAX...CAVU conditions expected for the 30-hour period. There is a
30% chance for east winds to reach greater than 6 knots Wednesday
morning.
KBUR...VFR conditions are expected through the period.
&&
.MARINE...22/111 PM.
For the Outer Waters, There is a forty percent chance of Small
Craft Advisory (SCA) level winds for the northwest portion of
the northern zone (PZZ670) on Wednesday, otherwise conditions
will remain below SCA levels through the forecast period.
For the Inner Waters north of Point Sal, conditions will remain
below SCA levels through the forecast period.
For the Inner Waters south of Point Conception, there is 70%
chance of SCA level winds on Thursday. The strongest winds will
occur from Ventura to Santa Monica. There is a 30 percent chance
of winds out to the Channel Islands, as well as the San Pedro
Channel to Catalina. Strongest winds will occur in the morning but
could hang through mid afternoon. Otherwise conditions will
remain below SCA levels through the forecast period.
&&
.FIRE WEATHER...22/150 PM.
Through Wednesday afternoon, elevated to brief critical fire
weather conditions will persist with very warm and dry air and
fuels. Breezy offshore winds with gusts between 15 and 30 mph will
continue over the wind prone areas.
Wednesday night through Friday, a moderate to strong Santa Ana
wind event will bring widespread critical conditions to Los
Angeles and Ventura Counties, and elevated to brief critical
conditions for Santa Barbara and San Luis Obispo Counties. The
previous Fire Weather Watch has been converted to a Red Flag
Warning for most of Los Angeles and Ventura Counties. There is
still some uncertainty in the strength of the winds, but peak
gusts between 45 and 65 mph is the most likely outcome.
Humidities will lower to 2 to 9 percent and temperatures will
remain well above normal with highs generally in the 90s. This has
all the makings for a dangerous fire weather scenario, similar to
or worse than the recent October 10-11 event that produced the
Saddleridge Fire.
The fuels and vegetation are critically dry. The expected weather
will create an environment ripe for large and dangerous fire
growth, especially Thursday and Friday. We urge everyone to be
extremely cautious with any potential fire ignition sources. Fires
have started from things like cigarettes, camp fires, welding or
brush clearing equipment, and dragging towing chains.
&&
.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory in effect until 5 PM PDT this afternoon for
zones 34>36-40-41-44>46-547. (See LAXNPWLOX).
High Wind Watch in effect from late Wednesday night through
Friday morning for zones 44>46-53-54-88-547. (See LAXNPWLOX).
Red Flag Warning in effect from 1 AM Thursday to 10 PM PDT
Friday for zones 240-241-244>246-253-254-288-547-548. (See LAXRFWLOX).
PZ...NONE.
&&
.HAZARD POTENTIAL OUTLOOK (FRI-TUE).
Hot and dry conditions along with strong Santa Ana winds are
expected Friday, especially LA/Ventura Counties. Fire weather
conditions will be critical to extreme.
&&
PUBLIC...MW
AVIATION...Sweet/Kaplan
MARINE...Sweet
FIRE...Kittell
SYNOPSIS...DB/Delerme
weather.gov/losangelesThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 22, 5:34 AM PDT | Heat Advisory | LOX | Los Angeles | 14 hr |
| Oct 22, 2:13 PM PDT | High Wind Watch | LOX | Los Angeles | 24 hr |
Nearby
Red Flag Warnings in California, 2019Every red flag warning in 2019
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.