Alert archive / California / Red Flag Warnings in 2018
Red Flag Warning 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this red flag warning at Sep 24, 2018, 3:21 AM PDT. It was in force for 38 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
- Sep 24, 2018, 3:21 AM PDT (10:21 UTC)
- Expired
- Sep 25, 2018, 5:00 PM PDT
- In force
- 38 hr
- Issued by
- NWS San Francisco Bay Area, CA
The text
As transmitted.
942 WWUS86 KMTR 241021 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco CA 321 AM PDT Mon Sep 24 2018 ...Red Flag Warning in effect through Tuesday afternoon for low humidity and dry offshore winds for the North and East Bay Hills... .A very dry airmass with light to moderate offshore winds will continue today through at least Tuesday and possibly midweek. The combination of these weather conditions with very dry fuels will create critical fire weather conditions through at least Tuesday afternoon. CAZ507-242100- /O.NEW.KMTR.FW.W.0004.180924T1021Z-180926T0000Z/ North Bay Mountains- 321 AM PDT Mon Sep 24 2018 ...RED FLAG WARNING IN EFFECT UNTIL 5 PM PDT TUESDAY FOR LOW HUMIDITY AND OFFSHORE WINDS FOR THE NORTH BAY MOUNTAINS... The National Weather Service in San Francisco has issued a Red Flag Warning, which is in effect until 5 PM PDT Tuesday. * AFFECTED AREA...The North Bay Mountains. Fire weather zone 507 which includes all locations above 1000 feet in Napa, Sonoma and Marin Counties. * WIND...North to Northeast winds 5 to 15 mph today but increasing Monday night into Tuesday 10 to 20 mph with gusts to 35 mph. * HUMIDITY...5 to 15% with little or no night time recovery through midweek. * HIGHEST THREAT...The next burst of moderate winds is forecast to arrive during the overnight hours of Monday into early Tuesday morning across the Napa hills. * IMPACTS...any fires that develop will likely spread rapidly. 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. && $$ CAZ511-242100- /O.NEW.KMTR.FW.W.0004.180924T1021Z-180926T0000Z/ East Bay Hills and the Diablo Range- 321 AM PDT Mon Sep 24 2018 ...RED FLAG WARNING IN EFFECT UNTIL 5 PM PDT TUESDAY FOR LOW HUMIDITY AND DRY OFFSHORE WINDS FOR THE EAST BAY HILLS... The National Weather Service in San Francisco has issued a Red Flag Warning, which is in effect until 5 PM PDT Tuesday. * AFFECTED AREA...The East Bay Hills. Fire weather zone 511 which includes all locations above 1000 feet for the East Bay and Diablo Range of Santa Clara county including Mt Hamilton. * WIND...Northeast winds 5 to 15 mph today but increasing 10 to 20 mph with gusts to 35 mph tonight into early Tuesday morning. * HUMIDITY...5 to 15% and locally lower with little or no night time recovery through midweek. * IMPACTS...any fires that develop will likely spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
3 follow-up statements
864 WWUS86 KMTR 242022 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco CA 122 PM PDT Mon Sep 24 2018 ...Red Flag Warning in effect through Tuesday afternoon for low humidity and dry offshore winds for the North Bay Mountains and East Bay Hills... .A very dry airmass with light to moderate offshore winds will continue today through at least Tuesday and possibly midweek. The combination of these weather conditions with very dry fuels will create critical fire weather conditions through at least Tuesday afternoon. CAZ507-250500- /O.CON.KMTR.FW.W.0004.000000T0000Z-180926T0000Z/ North Bay Mountains- 122 PM PDT Mon Sep 24 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT TUESDAY FOR LOW HUMIDITY AND OFFSHORE WINDS FOR THE NORTH BAY MOUNTAINS... * AFFECTED AREA...The North Bay Mountains. Fire weather zone 507 which includes all locations above 1000 feet in Napa, Sonoma and Marin Counties. * WIND...North to Northeast winds 5 to 15 mph today but increasing Monday night into Tuesday 10 to 20 mph with gusts to 35 mph. * HUMIDITY...5 to 15% with little or no night time recovery through midweek. * HIGHEST THREAT...The next burst of moderate winds is forecast to arrive during the overnight hours of Monday into early Tuesday morning across the Napa hills. * IMPACTS...any fires that develop will likely spread rapidly. 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. && $$ CAZ511-250500- /O.CON.KMTR.FW.W.0004.000000T0000Z-180926T0000Z/ East Bay Hills and the Diablo Range- 122 PM PDT Mon Sep 24 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT TUESDAY FOR LOW HUMIDITY AND DRY OFFSHORE WINDS FOR THE EAST BAY HILLS... * AFFECTED AREA...The East Bay Hills. Fire weather zone 511 which includes all locations above 1000 feet for the East Bay and Diablo Range of Santa Clara county including Mt Hamilton. * WIND...Northeast winds 5 to 15 mph today but increasing 10 to 20 mph with gusts to 35 mph tonight into early Tuesday morning. * HUMIDITY...5 to 15% and locally lower with little or no night time recovery through midweek. * IMPACTS...any fires that develop will likely spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
573 WWUS86 KMTR 251027 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco CA 327 AM PDT Tue Sep 25 2018 ...Red Flag Warning in effect through 5 pm Tuesday for low humidity and dry offshore winds for the North Bay Mountains and East Bay Hills... .A very dry airmass with light to moderate offshore winds will continue through this afternoon. CAZ507-252200- /O.CON.KMTR.FW.W.0004.000000T0000Z-180926T0000Z/ North Bay Mountains- 327 AM PDT Tue Sep 25 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON FOR LOW HUMIDITY AND OFFSHORE WINDS FOR THE NORTH BAY MOUNTAINS... * AFFECTED AREA...The North Bay Mountains. Fire weather zone 507 which includes all locations above 1000 feet in Napa, Sonoma and Marin Counties. * WIND...Northeast winds 5 to 15 mph with gusts 20 to 30 mph. * HUMIDITY...9 to 19%. * HIGHEST THREAT...The hills of Napa and northeast Sonoma county above 1000 feet. * IMPACTS...any fires that develop will likely spread rapidly. 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. && $$ CAZ511-252200- /O.CON.KMTR.FW.W.0004.000000T0000Z-180926T0000Z/ East Bay Hills and the Diablo Range- 327 AM PDT Tue Sep 25 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON FOR LOW HUMIDITY AND DRY OFFSHORE WINDS FOR THE EAST BAY HILLS... * AFFECTED AREA...The East Bay Hills. Fire weather zone 511 which includes all locations above 1000 feet for the East Bay and Diablo Range of Santa Clara county including Mt Hamilton. * WIND...Northeast winds 5 to 15 mph with gusts 20 to 30 mph. * HUMIDITY...9 to 19%. * IMPACTS...any fires that develop will likely spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
670 WWUS86 KMTR 260011 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco CA 511 PM PDT Tue Sep 25 2018 CAZ507-511-260115- /O.EXP.KMTR.FW.W.0004.000000T0000Z-180926T0000Z/ North Bay Mountains-East Bay Hills and the Diablo Range- 511 PM PDT Tue Sep 25 2018 ...RED FLAG WARNING HAS EXPIRED FOR LOW HUMIDITY AND DRY OFFSHORE WINDS FOR THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. Low relative humidities will persist through tonight. However, wind speeds have been trending lighter and are forecast to remain below Red Flag Warning criteria. Nonetheless, precautions should still be taken given the critically dry weather and fuel conditions across this region. $$
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.