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Red Flag Warning

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.

&&

$$



Red Flag Warning

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.

&&

$$



U.S. Dept. of Commerce
NOAA National Weather Service
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Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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