Red Flag Warning issued November 4 at 9:22AM PST until November 7 at 7:00AM PST by NWS San Francisco CA
…RED FLAG WARNING IN EFFECT TUESDAY MORNING THROUGH THURSDAY
MORNING FOR THE BAY AREA AND CENTRAL COAST AS STRONG OFFSHORE
WINDS AND CRITICALLY DRY CONDITIONS ARE EXPECTED TO DEVELOP…
.Offshore winds are anticipated to increase early Tuesday morning
and persist through Thursday morning. North to northeasterly wind
gusts will average between 25 and 50 mph, particularly across the
higher terrain of the Santa Cruz Mountains, East Bay Hills, North
Bay Mountains, as well as interior portions of Napa and Sonoma
counties. In particular, these areas of Napa and Sonoma counties
have an increased likelihood of wind gusts in excess of 55 mph
late Tuesday and through the day on Wednesday. Afternoon humidity
values will fall to between 15 and 25 percent. Overnight humidity
recovery will be poor with readings between 25 and 45 percent.
The combination of the aforementioned winds and humidity will
translate to fires exhibiting a large resistance to control and
thereby creating a hazardous and extreme wildfire environment.
Fire crews and residents are urged to remain abreast of the
weather forecast over the next couple of days.
* AFFECTED AREA…Fire Weather Zone 006 San Francisco, Fire
Weather Zone 502 Marin Coastal Range, Fire Weather Zone 503
Sonoma Coastal Range, Fire Weather Zone 504 North Bay Interior
Mountains, Fire Weather Zone 506 North Bay Interior Valleys,
Fire Weather Zone 508 San Francisco Bay Shoreline, Fire
Weather Zone 509 San Francisco Peninsula Coast, Fire Weather
Zone 510 East Bay Interior Valleys, Fire Weather Zone 512
Santa Cruz Mountains, Fire Weather Zone 513 Santa Clara Valley
Including San Jose, Fire Weather Zone 514 Eastern Santa Clara
Hills, Fire Weather Zone 515 East Bay Hills, Fire Weather Zone
517 Santa Lucia Mountains and Los Padres National Forest, Fire
Weather Zone 518 Mountains of San Benito County And Interior
Monterey County including Pinnacles National Park and Fire
Weather Zone 529 Northern Monterey Bay.
* TIMING…11 AM Tuesday until 7 AM Thursday.
* WINDS…Offshore winds up to or above 25 mph with gusts in
excess of 55 mph.
* RELATIVE HUMIDITY…Afternoon humidity as low as 15%. Overnight
humidity recovery between 25 and 45%.
* LIGHTNING…None anticipated.
* IMPACTS…Despite recent rainfall, a long duration offshore flow
event is anticipated. This will result in the rapid curing of
fuels. The combination of strong winds and low humidity will
cause fire to rapidly grow in size and intensity. Outdoor
burning is not recommended and may be prohibited in some areas.
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.
