Red Flag Warning , Sun. Dec. 6, 11pm - Mon. Dec. 7, 5pm (nb. Point Reyes Ntl Seashore) & Burn Ban Thru Wed. Dec. 9

...Late season offshore wind event tonight through Monday....Northeast winds will develop before midnight across the North and East Bay hills. Winds will increase overnight into Monday morning and overspread much of the Bay Area. The strongest winds will remain in the hills but also drop into lower elevations including the coastline from Sonoma to San Mateo. The strongest winds are expected during the morning hours of Monday with
widespread gusts to 45 mph and localized gusts to 60 mph in the hills.

...RED FLAG WARNING NOW IN EFFECT FROM 11 PM THIS EVENING TO 5 PM PST MONDAY FOR GUSTY OFFSHORE WINDS FOR THE NORTH AND EAST BAY AS WELL AS THE SANTA CRUZ MOUNTAINS AND COASTAL SAN MATEO...

* AFFECTED AREA (See Link, below--map of weather zones):...Fire Weather Zone 505 Coastal North Bay Including Point Reyes National Seashore, Fire Weather Zone 506 North Bay Interior Valleys, Fire Weather Zone 507 North Bay Mountains, Fire Weather Zone 509 San Francisco Peninsula Coast, Fire Weather Zone 510 East Bay Interior Valleys, Fire Weather Zone 511 East Bay Hills and the Diablo Range and Fire Weather Zone 512 Santa Cruz Mountains.

* TIMING...Winds will increase before midnight tonight then increase overnight into Monday morning. The strongest winds are forecast Monday morning through midday before slowly easing late Monday afternoon.

* WINDS...North 15 to 25 mph with frequent gusts up to 45 mph above 1000 feet. Local gusts to 60 mph for wind favored locations around Mt Saint Helena, Mount Diablo and Mt Tamalpais.

* RELATIVE HUMIDITY...Humidity will be moderate tonight from 40-50% but gradually lower to 25-35% by midday Monday.

* TEMPERATURES...Record highs into the 70s on Monday.

* IMPACTS...Any new starts aligned with wind will likely show rapid growth as fuels remain at or near all time record dry levels for early December. Strong winds could cause power outages as well as downed trees and limbs. 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.

Map link: https://www.weather.gov/media/pimar/FireZone/ca_n_firezone.pdf