Red Flag Warning issued November 6 at 4:57PM PST until November 7 at 7:00AM PST by NWS San Francisco CA
…RED FLAG WARNING IN EFFECT THROUGH THURSDAY MORNING FOR THE
BAY AREA FOR STRONG OFFSHORE WINDS AND CRITICALLY DRY CONDITIONS.
…FOR THE CENTRAL COAST THE RED FLAG WARNING IS EXPIRING AT 5 PM
THIS EVENING AS CONDITIONS IMPROVE…
.Strong and gusty offshore winds, critical relative humidity, and
dry fuels continue across much of the region. North to
northeasterly wind gusts will average between 25 and 40 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. Wind gusts between
30 to 40 mph with occasional gusts greater than 55 mph will
continue across the North Bay interior mountains through
Wednesday evening. Afternoon humidity values will range between
the single digits and 25 percent. Overnight humidity recovery
will be poor between 20 and 45 percent. Fire crews and residents
are urged to remain abreast of the weather forecast through
Thursday morning.
* 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 and Fire Weather
Zone 529 Northern Monterey Bay.
* TIMING…11 AM Tuesday until 7 AM Thursday.
* WINDS…Northeast 10 to 20 mph with gusts up to 35 mph.
* RELATIVE HUMIDITY…As low as 12 percent.
* 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…and low relative humidity can contribute to
extreme fire behavior.
