Alert archive / California / Red Flag Warnings in 2018
Red Flag Warning 5, NWS Los Angeles, CA
NWS Los Angeles, CA issued this red flag warning at Jul 5, 2018, 9:50 AM PDT for Los Angeles County, California. It took effect at Jul 6, 2018, 3:00 AM PDT. It was in force for 39 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 5, 2018, 9:50 AM PDT (16:50 UTC)
- In effect from
- Jul 6, 2018, 3:00 AM PDT
- Expired
- Jul 7, 2018, 6:00 PM PDT
- In force
- 39 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 16:55 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.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 4.8 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
- 1794 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
275 WWUS86 KLOX 051650 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 950 AM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT LATE TONIGHT INTO SATURDAY FOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW HUMIDITIES... .A significant heat wave is expected to affect Southwest California through Sunday. The peak of the heat wave will be Friday and Saturday when widespread record breaking triple digit heat is expected. The extreme heat in combination with single digit humidities and gusty north winds will likely bring critical fire weather conditions across the mountains, Santa Barbara south coast, Santa Clarita Valley, San Fernando Valley, and Santa Monica mountains. The strongest north winds for these areas are expected to occur Friday morning through Saturday morning. In addition, the extreme heat will create an unstable air mass that will be capable of producing large vertical plume growth with any new fire ignitions, especially in the mountains and foothills. CAZ253-254-060000- /O.UPG.KLOX.FW.A.0004.180706T1000Z-180708T0100Z/ /O.NEW.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 950 AM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY 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 north winds, hot temperatures, and low relative humidity, which is in effect from 3 AM Friday to 6 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * Winds...Areas of north winds 20 to 30 mph with gusts to 45 mph, strongest through the Interstate 5 corridor. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 3 to 10 percent on Friday, increasing to 7 to 15 percent on Saturday. Very poor humidity recovery tonight and Friday night. * Temperatures...Highs 95 to 107 degrees across lower elevations on Friday and Saturday. Lows Friday night in the 80s across the foothills and lower mountains. * Thunderstorms...There is a slight chance of thunderstorms with isolated dry lightning strikes across the eastern San Gabriels late Saturday afternoon. Any storms that develop will be capable of producing gusty and erratic winds. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ246-288-060000- /O.UPG.KLOX.FW.A.0004.180706T1000Z-180708T0100Z/ /O.NEW.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Santa Monica Mountains Recreational Area-Santa Clarita Valley- 950 AM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA MONICA MOUNTAINS AND SANTA CLARITA VALLEY... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty north winds, hot temperatures, and low relative humidity, which is in effect from 3 AM Friday to 6 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * Winds...Areas of north winds 15 to 25 mph with gusts to 35 mph. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 3 to 6 percent on Friday rising to 7 to 12 percent on Saturday. Very poor humidity recovery Friday night. * Temperatures...Highs 101 to 111 degrees on Friday, 98 to 108 on Saturday. Lows Friday night 75 to 88. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ252-060000- /O.UPG.KLOX.FW.A.0004.180706T1000Z-180708T0100Z/ /O.NEW.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Santa Barbara County Mountains- 950 AM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty north winds, hot temperatures, and low relative humidity, which is in effect from 3 AM Friday to 6 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * Winds...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph, strongest through the Santa Ynez Range, especially near Montecito Hills. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 5 to 10 percent on Friday and Saturday. Very poor humidity recovery Friday night. * Temperatures...Highs 98 to 106 degrees across lower elevations on Friday and Saturday. Lows Friday night 78 to 88 across the foothills and lower mountains. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ239-060000- /O.UPG.KLOX.FW.A.0004.180706T2100Z-180707T1700Z/ /O.NEW.KLOX.FW.W.0005.180706T2100Z-180707T1700Z/ Santa Barbara County South Coast- 950 AM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT FROM 2 PM FRIDAY TO 10 AM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA SOUTH COAST... The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty north winds, hot temperatures, and very low relative humidity, which is in effect from 2 PM Friday to 10 AM PDT Saturday. The Fire Weather Watch is no longer in effect. * Winds...Areas of northwest to north winds 15 to 30 mph with gusts to 45 mph, strongest in the foothills, especially above Montecito. * Relative Humidity...Minimum humidities 5 to 10 percent, rising slightly on Saturday. Very poor humidity recovery Friday night in the foothills and windy areas. * Temperatures...Highs 94 to 103 degrees on Friday, slightly cooler on Saturday. Lows Friday night 79 to 89 across the foothills and wind prone areas. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ547-060000- /O.NEW.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Los Angeles County San Fernando Valley- 950 AM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY 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 winds, hot temperatures, and low relative humidity, which is in effect from 3 AM Friday to 6 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * Winds...Areas of north winds 10 to 20 mph with gusts to 30 mph. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 3 to 6 percent on Friday rising to 7 to 12 percent on Saturday. Very poor humidity recovery Friday night. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ Gomberg
6 follow-up statements
504 WWUS86 KLOX 052247 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 347 PM PDT Thu Jul 5 2018 ...RED FLAG WARNING IN EFFECT LATE TONIGHT INTO SATURDAY FOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW HUMIDITIES... .A significant heat wave will affect Southwest California through Sunday. The peak of the heat wave will be Friday and Saturday when widespread record breaking triple digit heat is expected. The extreme heat in combination with single digit humidities and gusty north winds will likely bring critical fire weather conditions across the mountains, Santa Barbara south coast, Santa Clarita Valley, San Fernando Valley, and Santa Monica mountains. The strongest north winds for these areas are expected to occur Friday morning through Saturday morning where gusts between 35 and 45 mph will be common, with isolated gusts up to 50 mph in favored mountain locations. In addition, the extreme heat will create an unstable air mass that will be capable of producing large vertical plume growth with any new fire ignitions, especially in the mountains and foothills. Red Flag conditions mean that there is the potential for rapid fire growth and extreme fire behavior. Brief critical fire weather conditions are also possible for the Ventura county valleys and Central Coast. CAZ253-254-061800- /O.CON.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 347 PM PDT Thu Jul 5 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Areas of north winds 20 to 30 mph with gusts to 45 mph except isolated gusts up to 50 mph near Whitaker Peak. Strongest winds through the Interstate 5 corridor. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 2 to 8 percent on Friday, increasing to 7 to 15 percent on Saturday. Very poor humidity recovery tonight and Friday night. * Temperatures...Highs 97 to 107 degrees across lower elevations on Friday and Saturday. Lows Friday night in the 80s across the foothills and lower mountains. * Thunderstorms...There is a slight chance of thunderstorms with isolated dry lightning strikes across the eastern San Gabriels late Saturday afternoon. Any storms that develop will be capable of producing gusty and erratic winds. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ246-288-061800- /O.CON.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Santa Monica Mountains Recreational Area-Santa Clarita Valley- 347 PM PDT Thu Jul 5 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA MONICA MOUNTAINS AND SANTA CLARITA VALLEY... * Winds...Areas of north winds 15 to 25 mph with gusts to 35 mph except isolated gusts over 40 mph across the Santa Monica mountains. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 2 to 6 percent on Friday rising to 7 to 12 percent on Saturday. Very poor humidity recovery Friday night. * Temperatures...Highs 102 to 112 degrees on Friday, 98 to 108 on Saturday. Lows Friday night 75 to 88. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ547-061800- /O.CON.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Los Angeles County San Fernando Valley- 347 PM PDT Thu Jul 5 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...Areas of north winds 10 to 20 mph with gusts to 30 mph. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 2 to 6 percent on Friday rising to 7 to 12 percent on Saturday. Very poor humidity recovery Friday night. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ252-061800- /O.CON.KLOX.FW.W.0005.180706T1000Z-180708T0100Z/ Santa Barbara County Mountains- 347 PM PDT Thu Jul 5 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 3 AM FRIDAY TO 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS... * Winds...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph, except isolated gusts to 50 mph in the hills above Gaviota and Montecito. Strongest winds through the Santa Ynez Range. Peak winds expected Friday morning into Saturday morning. * Relative Humidity...Minimum humidities 5 to 10 percent on Friday and Saturday. Very poor humidity recovery Friday night. * Temperatures...Highs 98 to 106 degrees across lower elevations on Friday and Saturday. Lows Friday night 78 to 88 across the foothills and lower mountains. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ239-061800- /O.CON.KLOX.FW.W.0005.180706T2100Z-180707T1700Z/ Santa Barbara County South Coast- 347 PM PDT Thu Jul 5 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM FRIDAY TO 10 AM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA SOUTH COAST... * Winds...Areas of northwest to north winds 15 to 30 mph with gusts to 45 mph, except isolated gusts to 50 mph in the foothills, especially above Gaviota and Montecito. * Relative Humidity...Minimum humidities 5 to 10 percent, rising slightly on Saturday. Very poor humidity recovery Friday night in the foothills and windy areas. * Temperatures...Highs 95 to 105 degrees on Friday, slightly cooler on Saturday. Lows Friday night 79 to 89 across the foothills and wind prone areas. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ Gomberg
001 WWUS86 KLOX 061711 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1011 AM PDT Fri Jul 6 2018 ...RED FLAG WARNING IN EFFECT THROUGH SATURDAY FOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW HUMIDITIES... .A significant heat wave will affect Southwest California through Sunday. The peak of the heat wave will be today into Saturday when widespread record breaking triple digit heat is expected. The extreme record breaking heat in combination with single digit humidities and gusty north winds will continue to bring very critical fire weather conditions across the mountains, Santa Barbara south coast, Santa Clarita Valley, San Fernando Valley, and Santa Monica mountains. The strongest north winds for these areas are expected to occur through Saturday morning where gusts between 35 and 45 mph will be common, with isolated gusts up to 50 mph in favored mountain locations. In addition, the extreme heat will create an unstable air mass that will be capable of producing very large vertical plume growth with any new fire ignitions, especially in the mountains and foothills. Red Flag conditions mean that there is the potential for rapid fire growth and extreme fire behavior. Brief critical fire weather conditions are also possible for the Ventura county valleys, other portions of Los Angeles county (including the coastal plain), and Central Coast. CAZ253-254-070000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 1011 AM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Areas of north winds 20 to 30 mph with gusts to 45 mph except isolated gusts up to 50 mph near Whitaker Peak. Strongest winds through the Interstate 5 corridor. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 2 to 8 percent today, increasing to 7 to 15 percent on Saturday. Very poor humidity recovery tonight. * Temperatures...Highs 99 to 109 degrees across lower elevations today, with slight cooling on Saturday. Lows tonight in the 80s to around 90 across the foothills and lower mountains. * Thunderstorms...There is a slight chance of thunderstorms with isolated dry lightning strikes across the eastern San Gabriels late Saturday afternoon. Any storms that develop will be capable of producing gusty and erratic winds. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ246-288-070000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Monica Mountains Recreational Area-Santa Clarita Valley- 1011 AM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA MONICA MOUNTAINS AND SANTA CLARITA VALLEY... * Winds...Areas of north winds 15 to 30 mph with gusts to 40 mph. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 2 to 6 percent today rising to 7 to 12 percent on Saturday. Very poor humidity recovery tonight. * Temperatures...Highs 106 to 116 degrees today, 98 to 108 on Saturday. Lows 78 to 90. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ547-070000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Los Angeles County San Fernando Valley- 1011 AM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...Areas of north winds 10 to 20 mph with gusts to 30 mph. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 2 to 6 percent today rising to 7 to 12 percent on Saturday. Very poor humidity recovery tonight. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ252-070000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Barbara County Mountains- 1011 AM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS... * Winds...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph, except isolated gusts to 50 mph in the hills above Gaviota and Montecito. Strongest winds through the Santa Ynez Range. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 5 to 10 percent today and Saturday. Very poor humidity recovery tonight. * Temperatures...Highs 98 to 108 degrees across lower elevations today then slight cooling on Saturday. Lows tonight 80 to 90 across the foothills and lower mountains. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ239-070000- /O.CON.KLOX.FW.W.0005.180706T2100Z-180707T1700Z/ Santa Barbara County South Coast- 1011 AM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 AM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA SOUTH COAST... * Winds...Areas of northwest to north winds 15 to 30 mph with gusts to 45 mph, except isolated gusts to 50 mph in the foothills, especially above Gaviota and Montecito. * Relative Humidity...Minimum humidities 5 to 15 percent today, rising slightly on Saturday. Very poor humidity recovery tonight in the foothills and windy areas. * Temperatures...Highs 97 to 107 degrees today, slightly cooler on Saturday. Lows tonight 80 to 90 across the foothills and wind prone areas. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ Gomberg
749 WWUS86 KLOX 062244 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 344 PM PDT Fri Jul 6 2018 ...RED FLAG WARNING IN EFFECT THROUGH SATURDAY FOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW HUMIDITIES... .A significant heat wave will affect Southwest California through Sunday. The peak of the heat wave will be today into Saturday when widespread record breaking triple digit heat is expected. The extreme record breaking heat in combination with single digit humidities and gusty north winds will continue to bring extremely critical fire weather conditions across the mountains, Santa Barbara south coast, Santa Clarita Valley, San Fernando Valley, and Santa Monica mountains. The strongest north winds for these areas are expected to occur through Saturday morning where gusts between 35 and 45 mph will be common, with isolated gusts up to 50 mph in favored mountain locations. In addition, the extreme heat will create an unstable air mass that will be capable of producing very large vertical plume growth with any new fire ignitions, especially in the mountains and foothills. Red Flag conditions mean that there is the potential for rapid fire growth and extreme fire behavior. Brief critical fire weather conditions are also possible for the Ventura county valleys, other portions of Los Angeles county (including the coastal plain), and Central Coast. CAZ253-254-071730- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 344 PM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Areas of north winds 20 to 30 mph with gusts to 45 mph except isolated gusts up to 50 mph near Whitaker Peak. Strongest winds through the Interstate 5 corridor. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 2 to 8 percent today, increasing to 7 to 15 percent on Saturday. Very poor humidity recovery tonight. * Temperatures...Highs 99 to 109 degrees across lower elevations today, with slight cooling on Saturday. Lows tonight in the 80s to around 90 across the foothills and lower mountains. * Thunderstorms...There is a slight chance of thunderstorms with isolated dry lightning strikes across the eastern San Gabriels late Saturday afternoon. Any storms that develop will be capable of producing gusty and erratic winds. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ246-288-071730- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Monica Mountains Recreational Area-Santa Clarita Valley- 344 PM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA MONICA MOUNTAINS AND SANTA CLARITA VALLEY... * Winds...Areas of north winds 15 to 30 mph with gusts to 40 mph. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 2 to 6 percent today rising to 7 to 12 percent on Saturday. Very poor humidity recovery tonight. * Temperatures...Highs 106 to 116 degrees today, 98 to 108 on Saturday. Lows tonight 78 to 90. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ547-071730- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Los Angeles County San Fernando Valley- 344 PM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SAN FERNANDO VALLEY... * Winds...Areas of north winds 10 to 20 mph with gusts to 30 mph. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 2 to 6 percent today rising to 7 to 12 percent on Saturday. Very poor humidity recovery tonight. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ252-071730- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Barbara County Mountains- 344 PM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND VERY LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA COUNTY MOUNTAINS... * Winds...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph, except isolated gusts to 50 mph in the hills above Gaviota and Montecito. Strongest winds through the Santa Ynez Range. Peak winds expected through Saturday morning. * Relative Humidity...Minimum humidities 5 to 10 percent today and Saturday. Very poor humidity recovery tonight. * Temperatures...Highs 98 to 108 degrees across lower elevations today then slight cooling on Saturday. Lows tonight 80 to 90 across the foothills and lower mountains. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ239-071700- /O.CON.KLOX.FW.W.0005.000000T0000Z-180707T1700Z/ Santa Barbara County South Coast- 344 PM PDT Fri Jul 6 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 AM PDT SATURDAY FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA SOUTH COAST... * Winds...Areas of northwest to north winds 15 to 30 mph with gusts to 45 mph, except isolated gusts to 50 mph in the foothills, especially above Gaviota and Montecito. * Relative Humidity...Minimum humidities 5 to 15 percent today, rising slightly on Saturday. Very poor humidity recovery tonight in the foothills and windy areas. * Temperatures...Highs 97 to 107 degrees today, slightly cooler on Saturday. Lows tonight 80 to 90 across the foothills and wind prone areas. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ Gomberg
801 WWUS86 KLOX 071715 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1015 AM PDT Sat Jul 7 2018 ...RED FLAG WARNING IN EFFECT UNTIL 6 PM TODAY FOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO HOT TEMPERATURES, LOW HUMIDITIES, AND GUSTY ONSHORE WINDS... .Light offshore flow this morning will transition to onshore flow today, with gusty onshore winds across much of the forecast area this afternoon. The Santa Barbara south coast will see some cooling and higher humidities today associated with the onshore flow allowing the Red Flag Warning to expire, but foothill areas will remain very warm and dry with elevated fire weather conditions. Remaining Red Flag Warning areas will see continuation of hot and dry conditions today, with onshore winds gusting between 20 and 30 mph in the afternoon hours. Due to the hot and unstable conditions expected today, there is the potential for very large vertical plume growth with any new fires, especially over the mountains and foothills. A surge of monsoon moisture will bring a thunderstorm threat to our south and east today, with the leading edge of the mid level monsoon moisture and instability bringing a slight chance of thunderstorms to the eastern San Gabriels this afternoon and evening. If any thunderstorms were to develop, there would be the potential for isolated dry lightning strikes and gusty erratic surface winds. CAZ239-071815- /O.EXP.KLOX.FW.W.0005.000000T0000Z-180707T1700Z/ Santa Barbara County South Coast- 1015 AM PDT Sat Jul 7 2018 ...RED FLAG WARNING HAS EXPIRED FOR GUSTY NORTH WINDS, HOT TEMPERATURES, AND LOW RELATIVE HUMIDITY FOR THE SANTA BARBARA SOUTH COAST... CRITICAL RED FLAG CONDITIONS HAVE ENDED ACROSS THE SANTA BARBARA COUNTY SOUTH COAST, HOWEVER ELEVATED FIRE WEATHER CONDITIONS WILL CONTINUE, ESPECIALLY IN THE FOOTHILLS, WHERE VERY WARM AND DRY CONDITIONS PERSIST TODAY. $$ CAZ253-254-080000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 1015 AM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT TODAY FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Areas of south to southwest winds 10 to 20 mph with gusts to 30 mph in the afternoon. * Relative Humidity...Minimum humidities 7 to 15 percent today. * Temperatures...Highs 95 to 105 degrees across lower elevations today. * Thunderstorms...There is a slight chance of thunderstorms with isolated dry lightning strikes across the eastern San Gabriels late this afternoon and evening. Any storms that develop will be capable of producing gusty and erratic winds. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ246-288-080000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Monica Mountains Recreational Area-Santa Clarita Valley- 1015 AM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT TODAY FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE SANTA MONICA MOUNTAINS AND SANTA CLARITA VALLEY... * Winds...Areas of south winds 10 to 20 mph with gusts to 25 mph in the afternoon. * Relative Humidity...Minimum humidities 7 to 12 percent today. * Temperatures...Highs 100 to 108 today. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ547-080000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Los Angeles County San Fernando Valley- 1015 AM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT TODAY FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE SAN FERNANDO VALLEY... * Winds...Areas of south winds 8 to 15 mph with gusts to 22 mph in the afternoon. * Relative Humidity...Minimum humidities 7 to 12 percent today. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ252-080000- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Barbara County Mountains- 1015 AM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT TODAY FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE SANTA BARBARA COUNTY MOUNTAINS... * Winds...Areas of southeast to south winds 10 to 20 mph with gusts to 25 mph. * Relative Humidity...Minimum humidities 7 to 12 percent today. * Temperatures...Highs 95 to 105 degrees across lower elevations today. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ Gomberg
135 WWUS86 KLOX 072241 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 341 PM PDT Sat Jul 7 2018 ...RED FLAG WARNING IN EFFECT UNTIL 6 PM TODAY FOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO HOT TEMPERATURES, LOW HUMIDITIES, AND GUSTY ONSHORE WINDS... .Light offshore flow this morning transitioned to onshore flow this afternoon, with gusty onshore winds across much of the forecast area. While there is some relief near the coast today, inland areas have remained hot and dry. Remaining Red Flag Warning areas will see onshore winds gusting between 20 and 30 through the afternoon hours in combination with the hot and dry conditions. If any thunderstorms develop, there would be the potential for isolated dry lightning strikes and gusty erratic surface winds. CAZ253-254-080100- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- 341 PM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES... * Winds...Areas of south to southwest winds 10 to 20 mph with gusts to 30 mph in the afternoon. * Relative Humidity...Minimum humidities 7 to 15 percent today. * Temperatures...Highs 95 to 105 degrees across lower elevations today. * Thunderstorms...There is a slight chance of thunderstorms with isolated dry lightning strikes across the eastern San Gabriels late this afternoon and evening. Any storms that develop will be capable of producing gusty and erratic winds. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ246-288-080100- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Monica Mountains Recreational Area-Santa Clarita Valley- 341 PM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE SANTA MONICA MOUNTAINS AND SANTA CLARITA VALLEY... * Winds...Areas of south winds 10 to 20 mph with gusts to 25 mph in the afternoon. * Relative Humidity...Minimum humidities 7 to 12 percent today. * Temperatures...Highs 100 to 112 today. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ547-080100- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Los Angeles County San Fernando Valley- 341 PM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE SAN FERNANDO VALLEY... * Winds...Areas of south winds 8 to 15 mph with gusts to 22 mph in the afternoon. * Relative Humidity...Minimum humidities 7 to 12 percent today. * Temperatures...Highs 100 to 110 degrees today. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ CAZ252-080100- /O.CON.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Barbara County Mountains- 341 PM PDT Sat Jul 7 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING FOR HOT TEMPERATURES, LOW RELATIVE HUMIDITY, AND GUSTY ONSHORE WINDS FOR THE SANTA BARBARA COUNTY MOUNTAINS... * Winds...Areas of southeast to south winds 10 to 20 mph with gusts to 25 mph. * Relative Humidity...Minimum humidities 7 to 12 percent today. * Temperatures...Highs 95 to 105 degrees across lower elevations today. * Impacts...If fire ignition occurs, there could be rapid wildfire spread and very large vertical plume growth that would lead to a threat to life and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected. A combination of strong winds, hot temperatures, very low relative humidity and dry fuels could contribute to extreme fire danger and/or fire behavior. Use extreme caution with potential ignition sources. && $$ Gomberg
384 WWUS86 KLOX 080100 RFWLOX URGENT - FIRE WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 600 PM PDT Sat Jul 7 2018 CAZ246-252>254-288-547-080200- /O.EXP.KLOX.FW.W.0005.000000T0000Z-180708T0100Z/ Santa Monica Mountains Recreational Area- Santa Barbara County Mountains- Ventura County Mountains / Los Padres National Forest- Los Angeles County Mountains / Angeles National Forest- Santa Clarita Valley-Los Angeles County San Fernando Valley- 600 PM PDT Sat Jul 7 2018 ...RED FLAG WARNING WILL EXPIRE AT 6 PM PDT THIS EVENING FOR HOT TEMPERATURES...LOW RELATIVE HUMIDITY...AND GUSTY WINDS... A very hot and critically dry air mass in place the last several days to continue to slowly moderate through early next week as a strong ridge of high pressure over the region weakens. Fire weather conditions will gradually improve as onshore flow redevelops this evening; however, elevated fire weather will linger into Monday. Warm and dry conditions will possibly combine with onshore sea breezes at times to bring brief critical fire weather conditions into early next week. $$ Hall
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 Jul 5, 5:11 AM PDT, 4 hours 39 minutes earlier.
Area forecast discussion, Jul 5, 5:11 AM PDT, 4 hours 39 minutes before
Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
511 AM PDT Thu Jul 5 2018
New Aviation and Beaches Discussion
.SYNOPSIS...04/939 PM.
A strong high pressure system east of the region will build in
for late week bringing very hot weather to Southern California.
Partly cloudy skies and a cooling trend will develop over the
weekend as high is forecast to shift east. Above normal temperatures
will likely persist into next week.
&&
.SHORT TERM (TDY-SAT)...05/323 AM.
2 to 3 MB offshore trends over Srn Ca have inhibited marine layer
stratus formation. Skies will be sunny over the forecast area this
morning save for the VTA county coast and portions of the Central
Coast and LA county immediate coast.
Heat will be the dominant weather factor over the next three days
with a sub story of dangerous surf and rip currents across the
beaches. Anyone who runs away from dangers of the heat to the
beaches will face the dangers of the sea.
Currently a 599 mb high is over Colorado/Kansas and there are 588
DM hgts over Srn CA. This high will slide to the west and
strengthen through Friday when it will have 601 DM central hgts
over the 4 corners region and 596 hgts over LA county. The ridge
flattens somewhat Saturday and hgts over srn CA fall to about 594
DM. The hgts Friday are about as high as they get in July over
SoCal.
To further add to the heat the weak onshore west to east sfc grads
today will turn to near 3 MB offshore both Friday and Saturday
mornings. The near neutral North/South sfc grads will turn to near
6 MB offshore both Friday and Saturday mornings.
Max temps today will rise about 2 to 4 degrees across the coasts
but will rise about 10 degrees across the inland areas where max
temps will be 5 to 10 degrees above normal. The sunshine and the
already warm airmass will combine with the downsloping (and thus
warming) offshore flow on Friday to produce a record setting day
of dangerous heat. The inland areas which will not be affected but
the downsloping will warm the least only 6 to 9 degrees. The
coasts and vlys however will see a 12 to 18 degree jump in max
temps. Places like the San Fernando Vly will have max temps
between 106 and 113 degrees or about 15 to 20 degrees above
normal. The slightly lower hgts and some afternoon onshore trends
in the afternoon will allow for some cooling on Saturday but only
3 to 6 degrees.
The offshore flow that will develop each evening will keep many
vly and foothill area min temps in the 70s and even lower 80s
overnight both tonight and esp Saturday.
The combination both much above normal temps both during the day
and overnight will lead to dangerous heat conditions. The current
suite of excessive heat watches will be converted to heat warning
later today after proper coordination. People should begin to
make heat mitigation plans now.
The offshore gradients will produce local advisory level
northerly gusts tonight across the SBA south coast and near to the
LA/VTA county border. A stronger offshore push Saturday morning
will likely result in wind advisories for both of the above areas.
Todays low clouds will be the last seen during the period as the
offshore winds will eliminate them. Skies will turn partly cloudy
Friday and then cloudier still on Saturday as high level clouds
spin off from Hurricane Fabio and then over CA.
The location of the upper high over the 4 corners area will open
the door a crack for a some monsoon moisture to move into the LA
county area. Current mdls (esp the EC) keep the moisture to the
south and east of the area but still the position of the high
does warrant a slight chc of TSTMs Saturday afternoon for the
eastern San Gabriels.
.LONG TERM (SUN-WED)...05/345 AM.
The high will not weaken much during the extended period but its
center will shift to the east and settle over Iowa. Hgts will fall
to 594 DM Sunday and will remain near those levels through
Wednesday.
The offshore flow will turn onshore Sunday and then will increase
each day after that.
While the onshore flow at the sfc might eventually produce some
night time low clouds across the coasts think that the easterly
flow aloft will prevent stratus formation.
Max temps will fall through the period not so much inland but
more so across the coasts and vlys due to the stronger and earlier
sea breeze. By Wednesday max temps across the csts/vlys will be
back to near normal.
&&
.AVIATION...05/1205Z.
At 12Z, the marine layer depth was around 1000 feet deep at KLAX.
The top of the marine inversion was around 4300 feet with a
temperature near 23 degrees Celsius.
Moderate confidence in TAFs at coastal terminals with high
confidence elsewhere. Return to VFR conds will be generally
within one hour of TAF. There is a 20 percent chance of IFR or
lower cigs/vsbys at coastal TAF sites after 06Z.
KSBA: Light to occasionally moderate LLWS is possible after 00Z.
KLAX...Moderate confidence in 12Z TAF. There is a 30 percent
chance of IFR cigs/vsbys before returning to VFR between 15Z and
17Z. There is a 20 percent chance of IFR or lower cigs/vsbys at
coastal TAF sites after 06Z. Any east winds are expected to remain
below 8 knots.
KBUR...There is a 10 percent chance of MVFR vsbys between thru
16Z. There is a 20 percent chance of 27008kt between 00Z and 03Z.
&&
.MARINE...05/306 AM.
SCA conds are expected to become widespread across the coastal
waters by late this afternoon or early evening. There is a 30
percent chance that SCA conds do not occur across the inner
waters this evening. A Gale Watch has been issued for the Outer
Waters and is in effect from late Friday afternoon through
Saturday night. There is a 30 percent chance that Gale force winds
do not occur. There is also a 30 percent chance of Gale force
winds across the Inner Waters north of Point Sal during this time.
A SCA will likely be needed for the Santa Barbara Channel Friday
evening. Patchy dense fog is possible at times this evening
through this weekend.
A long period south swell generated by Hurricane Fabio will
continue to move across the coastal waters through Friday
evening, before gradually diminishing. This swell will lead to
hazardous boating conditions nearshore due to large breaking
waves. In addition, hazardous mixed seas are likely due to the
combination of south swell and building short period northwest
waves.
&&
.BEACHES...05/503 AM.
A long-period SE to S swell from what once was Hurricane Fabbio
will peak in intensity across the coastal waters through Friday
before gradually diminishing. This swell, along with a building
short period northwest swell, is expected to produce high surf
with dangerous breaking waves nearing 10 feet. Strong rip currents
are expected and sneaker waves will be possible with this south
swell.
Minor coastal flooding is a concern for low-lying coastal areas
that have south to southeast exposure. Beach parking lots and
normally dry beach areas may be covered in sea water around the
late afternoon high tides. Any damage from the high surf is
expected to be minimal.
With record heat expected at the same time, and many people
heading to the beaches for relief, this swell event is likely to
be extremely dangerous. If entering the water, it always advised
to swim near an occupied lifeguard station.
&&
.FIRE WEATHER...05/509 AM.
A significant heat wave is projected to affect Southern California
through Sunday, bringing a prolonged period of elevated fire
weather conditions to the southwest California. The peak of the
heat wave is expected to be Friday through Saturday, when record
breaking triple digit heat will be likely across many inland
areas. The warmest valley, lower mountain, and desert locations
could soar to between 102 and 113 degrees on Friday and Saturday,
while portions of the Los Angeles County Coast and Santa Barbara
South Coast will likely approach or exceed 100 degrees due to a
northerly offshore wind component. This heat wave will be
accompanied with very low humidities, with the potential for
widespread single digit humidities on Friday, possibly lingering
into Saturday. In addition, there will likely be very poor
overnight humidity recoveries across the mountains and foothills
Thursday night and Friday night. Gusty northerly winds will add to
the fire weather threat, with the strongest winds focused across
the mountains (especially I-5 corridor and Santa Ynez mountains),
Santa Barbara South Coast, Santa Clarita Valley, and Santa Monica
mountains where gusts between 35 and 45 mph are expected. These
areas will have the potential for critical fire weather
conditions. A Fire Weather Watch is in effect for the
aforementioned areas. The strongest northerly winds are expected
late tonight into Friday morning and again Friday night into
Saturday morning when both LAX-Bakersfield and Santa Barbara-
Bakersfield gradients peak around -6 mb. Also of note is the gusty
north winds and very low humidities that develop Thursday night
across southern Santa Barbara County and portions of Los Angeles
county which could bring brief critical fire weather conditions to
those areas. Other areas that could see brief critical fire
weather conditions during this event include the San Fernando
Valley, Ventura county valleys, and interior portions of the
Central Coast.
Due to the hot and unstable conditions expected on Friday and
Saturday, there is the potential for large vertical plume growth
with any new fires, especially over the mountains and foothills. A
surge of monsoon moisture will bring a thunderstorm threat to our
south and east on Saturday, with the leading edge of the mid
level monsoon moisture and instability bringing a slight chance of
thunderstorms to the eastern San Gabriels late in the day. If any
thunderstorms were to develop, there would be the potential for
isolated dry lightning strikes and gusty erratic surface winds.
Very warm conditions are expected to linger on Sunday into early
next week, with some monsoon moisture potentially moving into the
region at times.
&&
.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement in effect through Friday evening for
zones 34-35-39. (See LAXCFWLOX).
Excessive Heat Watch in effect from Friday morning through
Saturday evening for zones 34>41-44>46-51>54-59-87-88-547. (See LAXNPWLOX).
High Surf Advisory in effect until 8 PM PDT Friday for zones
40-41-87. (See LAXCFWLOX).
Fire Weather Watch in effect from Friday afternoon through
Saturday morning for zone 239. (See LAXRFWLOX).
Fire Weather Watch in effect from late tonight through
Saturday afternoon for zones 246-252>254-288. (See LAXRFWLOX).
PZ...Small Craft Advisory in effect from 3 PM this afternoon to 3
AM PDT Sunday for zone 645. (See LAXMWWLOX).
Small Craft Advisory in effect from 3 PM this afternoon to 9
PM PDT this evening for zones 650-655. (See LAXMWWLOX).
Small Craft Advisory in effect from 9 PM this evening to 3 PM
PDT Friday for zones 670-676. (See LAXMWWLOX).
Gale Watch in effect from Friday afternoon through late
Saturday night for zones 670-673-676. (See LAXMWWLOX).
Small Craft Advisory in effect from 3 PM this afternoon to 3
PM PDT Friday for zone 673. (See LAXMWWLOX).
&&
.HAZARD POTENTIAL OUTLOOK (SAT-WED).
Excessive heat is likely across most of southwestern California
through Saturday with record high temperatures and warm overnight
conditions. Advisory-level northerly winds are possible through
Saturday morning across southern Santa Barbara County and through
the I-5 corridor. The hot, dry, and windy conditions will be
critically favorable for large fire growth. There is a small
threat for thunderstorms over the eastern portion on Saturday.
Heat advisories may be needed on Sunday.
&&
PUBLIC...Rorke
AVIATION...Munroe
MARINE...Munroe
BEACHES...Munroe
FIRE...Gomberg/RM
SYNOPSIS...STu/Hall
weather.gov/losangelesThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:36 PM PDT | Small Craft Advisory | LOX | 3 days | |
| Jul 5, 3:08 AM PDT | Gale Watch | LOX | 18 hr | |
| Jul 5, 11:01 AM PDT | Excessive Heat Warning | LOX | Los Angeles, Santa Barbara | 58 hr |
Nearby
Red Flag Warnings in California, 2018Every red flag warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.