Alert archive / California / Red Flag Warnings in 2020
Red Flag Warning 9, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this red flag warning at Oct 19, 2020, 10:57 AM PDT. It took effect at Oct 19, 2020, 11:00 PM PDT. It was in force for 33 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
- Oct 19, 2020, 10:57 AM PDT (17:57 UTC)
- In effect from
- Oct 19, 2020, 11:00 PM PDT
- Expired
- Oct 21, 2020, 8:00 AM PDT
- In force
- 33 hr
- Issued by
- NWS San Francisco Bay Area, CA
The text
As transmitted.
076 WWUS86 KMTR 191757 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco Bay Area 1057 AM PDT Mon Oct 19 2020 ...Bursts of gusty offshore winds and dry conditions will develop tonight and carry into the next several days... .These weather conditions, in combination with very dry fuels, will result in an increased risk of new wildfire starts and rapid wildfire spread. The first burst will primarily affect the North Bay Mountains Monday night through Wednesday morning. A lull in the offshore winds is expected from Wednesday morning through Wednesday evening, but drying will continue and carry over into the second burst. The culmination of offshore winds and very dry fuels, along with very dry conditions are possible from Wednesday night through Friday morning and has the potential to impact higher-terrain locations in the North Bay Mountains, along with locations in the East Bay Hills, the Diablo Range, and the Santa Cruz Mountains. CAZ507-200500- /O.UPG.KMTR.FW.A.0007.201020T0600Z-201021T1500Z/ /O.NEW.KMTR.FW.W.0009.201020T0600Z-201021T1500Z/ /O.NEW.KMTR.FW.A.0008.201022T0500Z-201023T1500Z/ North Bay Mountains- 1057 AM PDT Mon Oct 19 2020 ...RED FLAG WARNING IN EFFECT FROM 11 PM THIS EVENING TO 8 AM PDT WEDNESDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... . ..FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH FRIDAY MORNING FOR THE POTENTIAL FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONES 511 AND 512... The National Weather Service in San Francisco has issued a Red Flag Warning...which is in effect from 11 PM this evening to 8 AM PDT Wednesday. a Fire Weather Watch has also been issued. This Fire Weather Watch is in effect from Wednesday evening through Friday morning. * WIND...North to northeast 10 to 25 mph with gusts up to 40 mph. Winds will be stronger overnight. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 20-30% range with poor overnight recoveries in the 12-20% range. * HIGHEST THREAT...Mountains of Napa County and northeastern Sonoma County. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north- northeasterly winds, and low humidities. 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. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ CAZ511-200500- /O.NEW.KMTR.FW.A.0008.201022T0500Z-201023T1500Z/ East Bay Hills and the Diablo Range- 1057 AM PDT Mon Oct 19 2020 ...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH FRIDAY MORNING FOR THE POTENTIAL FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 511... The National Weather Service in San Francisco has issued a Fire Weather Watch...which is in effect from Wednesday evening through Friday morning. * AFFECTED AREA...FIRE WEATHER ZONE 511. * WIND...North to northeast 20 to 30 mph with gusts up to 40 mph. Winds will be stronger overnight. Locally stronger winds are possible over the higher ridges and peak. * HUMIDITY...Daytime humidities in the 25-30% range with poor overnight recoveries in the 12-17% range. * HIGHEST THREAT...The East Bay Hills. * IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ CAZ512-200500- /O.NEW.KMTR.FW.A.0008.201022T0800Z-201023T1500Z/ Santa Cruz Mountains- 1057 AM PDT Mon Oct 19 2020 ...FIRE WEATHER WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH FRIDAY MORNING FOR FOR THE POTENTIAL FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 512... The National Weather Service in San Francisco has issued a Fire Weather Watch...which is in effect from late Wednesday night through Friday morning. * AFFECTED AREA...FIRE WEATHER ZONE 512. * WIND...North to northeast 20 to 30 mph with gusts up to 40 mph. Winds will be stronger overnight. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 25-35% range with overnight humidities dropping to the 15-20% range. * HIGHEST THREAT...Locations with high fuels in the Santa Cruz Mountain Range. * IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. 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. && $$
4 follow-up statements
200 WWUS86 KMTR 200613 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco Bay Area 1113 PM PDT Mon Oct 19 2020 ...Dry conditions and bursts of gusty offshore winds forecast in the hills of the San Francisco Bay Area over the next several days... .Gusty, dry offshore winds and continued low humidity, in combination with very dry fuels, will result in an increased risk of new wildfire starts and rapid wildfire spread. The first burst of gusty northerly winds will primarily affect the North Bay Mountains Monday night through Wednesday morning. A lull in the offshore winds is expected from Wednesday morning through Wednesday evening, but drying will continue and carry over into the second burst from Wednesday night through Friday morning. This second offshore wind event will impact not only the higher terrain locations in the North Bay Mountains, but also locations in the East Bay Hills, the Diablo Range, and the Santa Cruz Mountains. CAZ507-201800- /O.CON.KMTR.FW.W.0009.000000T0000Z-201021T1500Z/ /O.CON.KMTR.FW.A.0008.201022T0500Z-201023T1500Z/ North Bay Mountains- 1113 PM PDT Mon Oct 19 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM PDT WEDNESDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM WEDNESDAY EVENING THROUGH FRIDAY MORNING FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... * AFFECTED AREA...North Bay Mountains. * WIND...Through Wednesday morning north to northeast 10 to 25 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. From Wednesday evening through Friday morning north to northeast 15 to 30 mph with gusts up to 50 mph. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-20 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...Mountains of Napa County and northeastern Sonoma County. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. 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. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ CAZ511-201800- /O.CON.KMTR.FW.A.0008.201022T0500Z-201023T1500Z/ East Bay Hills and the Diablo Range- 1113 PM PDT Mon Oct 19 2020 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM WEDNESDAY EVENING THROUGH FRIDAY MORNING FOR THE POTENTIAL FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 511... * AFFECTED AREA...East Bay Hills and Diablo Range. * WIND...North to northeast 15 to 30 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges and peak. * HUMIDITY...Daytime humidities in the 12-18 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...The East Bay Hills. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. 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. && $$ CAZ512-201800- /O.CON.KMTR.FW.A.0008.201022T0800Z-201023T1500Z/ Santa Cruz Mountains- 1113 PM PDT Mon Oct 19 2020 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH FRIDAY MORNING FOR FOR THE POTENTIAL FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 512... * AFFECTED AREA...Santa Cruz Mountains. * WIND...North to northeast 10 to 20 mph with gusts up to 35 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-20 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...Locations with high fuel loads in the Santa Cruz Mountain Range. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$
019 WWUS86 KMTR 201746 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco Bay Area 1046 AM PDT Tue Oct 20 2020 ...Dry conditions and bursts of gusty offshore winds forecast in the hills of the San Francisco Bay Area over the next several days... .The continuation of gusty, dry offshore winds and low humidity, in combination with very dry fuels, will result in an increased risk of new wildfire starts and rapid wildfire spread. Gusty northerly winds will initially affect the North Bay Mountains and East Bay Hills and Valleys late Wednesday evening and expand overnight into the Santa Cruz Mountains and portions of Coastal San Mateo County through Thursday morning. A lull in the offshore winds is expected from late Thursday morning through Thursday evening, but another burst is expected overnight and into Friday morning. CAZ507-210500- /O.UPG.KMTR.FW.A.0008.201022T0500Z-201023T1500Z/ /O.NEW.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ /O.CON.KMTR.FW.W.0009.000000T0000Z-201021T1500Z/ North Bay Mountains- 1046 AM PDT Tue Oct 20 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM PDT WEDNESDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... ...RED FLAG WARNING IN EFFECT FROM 10 PM WEDNESDAY TO 8 AM PDT FRIDAY FOR FIRE WEATHER ZONE 507... The National Weather Service in San Francisco has issued a Red Flag Warning...which is in effect from 10 PM Wednesday to 8 AM PDT Friday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...North Bay Mountains. * WIND...Through Wednesday evening north to northeast 10 to 25 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. From Wednesday evening through Friday morning north to northeast 15 to 30 mph with gusts up to 50 mph. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-20 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...Mountains of Napa County and northeastern Sonoma County. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. 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. && $$ CAZ511-210500- /O.UPG.KMTR.FW.A.0008.201022T0500Z-201023T1500Z/ /O.NEW.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ East Bay Hills and the Diablo Range- 1046 AM PDT Tue Oct 20 2020 ...RED FLAG WARNING IN EFFECT FROM 10 PM WEDNESDAY TO 8 AM PDT FRIDAY FOR FOR FIRE WEATHER ZONE 511... The National Weather Service in San Francisco has issued a Red Flag Warning...which is in effect from 10 PM Wednesday to 8 AM PDT Friday. The Fire Weather Watch is no longer in effect. * WIND...North to northeast 15 to 30 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-18 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...The East Bay Hills. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ512-210500- /O.UPG.KMTR.FW.A.0008.201022T0800Z-201023T1500Z/ /O.NEW.KMTR.FW.W.0010.201022T0800Z-201023T1500Z/ Santa Cruz Mountains- 1046 AM PDT Tue Oct 20 2020 ...RED FLAG WARNING IN EFFECT FROM 1 AM THURSDAY TO 8 AM PDT FRIDAY FOR FIRE WEATHER ZONE 512... The national weather service in San Francisco has issued a Red Flag Warning...which is in effect from 1 AM Thursday to 8 AM PDT Friday. The Fire Weather Watch is no longer in effect. * WIND...North to northeast 10 to 20 mph with gusts up to 35 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-20 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...Locations with high fuel loads in the Santa Cruz Mountains. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. 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. && $$ CAZ510-210500- /O.NEW.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ East Bay Interior Valleys- 1046 AM PDT Tue Oct 20 2020 ...RED FLAG WARNING IN EFFECT FROM 10 PM WEDNESDAY TO 8 AM PDT FRIDAY FOR FIRE WEATHER ZONE 510... The National Weather Service in San Francisco has issued a Red Flag Warning...which is in effect from 10 PM Wednesday to 8 AM PDT Friday. * AFFECTED AREA...FIRE WEATHER ZONE 510. * WIND...North to northeast 10 to 20 mph with gusts up to 35 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible as winds from the higher ridges and peaks mix down to the valley floors. * HUMIDITY...Daytime humidities in the 30-35 percent range but falling quickly overnight. Poor overnight recoveries expected, with widespread humidities in the 15-20 percent range. * IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ509-210500- /O.NEW.KMTR.FW.W.0010.201022T0800Z-201023T1500Z/ San Francisco Peninsula Coast- 1046 AM PDT Tue Oct 20 2020 ...RED FLAG WARNING IN EFFECT FROM 1 AM THURSDAY TO 8 AM PDT FRIDAY FOR FIRE WEATHER ZONE 509... The National Weather Service in San Francisco has issued a Red Flag Warning...which is in effect from 1 AM Thursday to 8 AM PDT Friday. * AFFECTED AREA...FIRE WEATHER ZONE 509. * WIND...North to northeast 15 to 20 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges, peaks, and passages that lead to the shoreline. * HUMIDITY...Daytime humidities gradually falling to the 15-30 percent range, even down to the coast. Poor overnight humidity recoveries in the 12-20 percent range. * HIGHEST THREAT...is located from Half Moon Bay southward as dry winds from the mountains race down to the coast. * 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. && $$
706 WWUS86 KMTR 210405 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco Bay Area 905 PM PDT Tue Oct 20 2020 ...Dry conditions and bursts of gusty offshore winds forecast in the hills of the San Francisco Bay Area over the next several days... .The overarching weather pattern prevails around the Bay Area, providing an increased risk of new wildfire starts and rapid wildfire spread this evening and through the end of the week. Gusty northerly winds and dry conditions provide the threat of new wildfire starts through Wednesday morning. After a brief lull, wind gusts will strengthen again on Wednesday evening over affecting the North Bay Mountains, East Bay Hills and Valleys, and expand in the early Thursday morning timeframe over the Santa Cruz Mountains and portions of San Mateo coast. Winds will once again weaken in the afternoon before another round of gustier offshore winds expected overnight Thursday into Friday morning. CAZ507-211200- /O.CON.KMTR.FW.W.0009.000000T0000Z-201021T1500Z/ /O.CON.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ North Bay Mountains- 905 PM PDT Tue Oct 20 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM PDT WEDNESDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 PM WEDNESDAY TO 8 AM PDT FRIDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... * AFFECTED AREA...FIRE WEATHER ZONE 507 including the North Bay Mountains. * WIND...Through Wednesday evening north to northeast 10 to 25 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. From Wednesday evening through Friday morning north to northeast 15 to 30 mph with gusts up to 50 mph. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-20 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...Mountains of Napa County and northeastern Sonoma County. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. 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. && $$ CAZ510-511-211200- /O.CON.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ East Bay Interior Valleys-East Bay Hills and the Diablo Range- 905 PM PDT Tue Oct 20 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 PM WEDNESDAY TO 8 AM PDT FRIDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONES 510 AND 511... * AFFECTED AREA...FIRE WEATHER ZONES 510 AND 511 including the East Bay Hills and the Diablo Range and the East Bay Interior Valleys * WIND...North to northeast 10 to 20 mph with gusts up to 35 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible as winds from the higher ridges and peaks mix down to the valley floors. * HUMIDITY...Daytime humidities in the 30-35 percent range but falling quickly overnight. Poor overnight recoveries expected, with widespread humidities in the 15-20 percent range. * 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. && $$ CAZ509-512-211200- /O.CON.KMTR.FW.W.0010.201022T0800Z-201023T1500Z/ San Francisco Peninsula Coast-Santa Cruz Mountains- 905 PM PDT Tue Oct 20 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM THURSDAY TO 8 AM PDT FRIDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONES 509 AND 512... * AFFECTED AREA...FIRE WEATHER ZONES 509 AND 512 including the Santa Cruz Mountains and the San Mateo Coastline * WIND...North to northeast 15 to 20 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges, peaks, and passages that lead to the shoreline. * HUMIDITY...Daytime humidities gradually falling to the 12-20 percent range, even down to the coast. Poor overnight humidity recoveries in the 20-30 percent range. * HIGHEST THREAT...is located from Half Moon Bay southward as dry winds from the mountains race down to the coast. * IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
091 WWUS86 KMTR 211459 RFWMTR URGENT - FIRE WEATHER MESSAGE National Weather Service San Francisco Bay Area 759 AM PDT Wed Oct 21 2020 ...Dry conditions and bursts of gusty offshore winds forecast in the hills of the San Francisco Bay Area over the next several days... .The overarching weather pattern prevails around the Bay Area, providing a continued risk of new wildfire starts and rapid wildfire spread this evening and through the end of the week. Gusty northerly winds and dry conditions provide the threat of new wildfire starts through Friday morning. After a brief lull during the day today, wind gusts will strengthen again on Wednesday evening affecting the North Bay Mountains, East Bay Hills and Valleys, and expand in the early Thursday morning timeframe over the Santa Cruz Mountains and portions of San Mateo coast. Winds will once again weaken in the afternoon before another round of gustier offshore winds take hold overnight Thursday into Friday morning. CAZ507-220400- /O.EXP.KMTR.FW.W.0009.000000T0000Z-201021T1500Z/ /O.CON.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ North Bay Mountains- 759 AM PDT Wed Oct 21 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PDT FRIDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... ...RED FLAG WARNING WILL EXPIRE AT 8 AM PDT THIS MORNING FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONE 507... * WIND...Wednesday evening through Friday morning north to northeast 15 to 30 mph with gusts up to 50 mph. Locally stronger winds are possible over the higher ridges and peaks. * HUMIDITY...Daytime humidities in the 12-20 percent range with poor overnight recoveries in the 20-30 percent range. * HIGHEST THREAT...Mountains of Napa County and northeastern Sonoma County. * IMPACTS...Any fires that start will likely spread rapidly due to the combination of dry fuels, gusty north-northeasterly winds, and low humidities. 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. && $$ CAZ510-511-220400- /O.CON.KMTR.FW.W.0010.201022T0500Z-201023T1500Z/ East Bay Interior Valleys-East Bay Hills and the Diablo Range- 759 AM PDT Wed Oct 21 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PDT FRIDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONES 510 AND 511... * AFFECTED AREA...FIRE WEATHER ZONES 510 AND 511 including the East Bay Hills and the Diablo Range and the East Bay Interior Valleys * WIND...North to northeast 10 to 20 mph with gusts up to 35 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible as winds from the higher ridges and peaks mix down to the valley floors. * HUMIDITY...Daytime humidities in the 30-35 percent range but falling quickly overnight. Poor overnight recoveries expected, with widespread humidities in the 15-20 percent range. * IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ CAZ509-512-220400- /O.CON.KMTR.FW.W.0010.201022T0800Z-201023T1500Z/ San Francisco Peninsula Coast-Santa Cruz Mountains- 759 AM PDT Wed Oct 21 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 AM THURSDAY TO 8 AM PDT FRIDAY FOR GUSTY OFFSHORE WINDS AND DRY CONDITIONS FOR FIRE WEATHER ZONES 509 AND 512... * AFFECTED AREA...FIRE WEATHER ZONES 509 AND 512 including the Santa Cruz Mountains and the San Mateo Coastline. * WIND...North to northeast 15 to 20 mph with gusts up to 40 mph. Winds will be strongest during the overnight hours. Locally stronger winds are possible over the higher ridges, peaks, and passages that lead to the shoreline. * HUMIDITY...Daytime humidities gradually falling to the 12-20 percent range, even down to the coast. Poor overnight humidity recoveries in the 20-30 percent range. * HIGHEST THREAT...is located from Half Moon Bay southward as dry winds from the mountains race down to the coast. * 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. && $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 19, 10:57 AM PDT | Fire Weather Watch | MTR | San Mateo, Santa Clara, Santa Cruz | 24 hr |
| Oct 19, 2:41 PM PDT | Gale Watch | MTR | 12 hr | |
| Oct 19, 2:41 PM PDT | Small Craft Advisory | MTR | 36 hr |
Nearby
Red Flag Warnings in California, 2020Every red flag warning in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.