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Napa County OES
Friday September 25th, 2020 :: 10:41 a.m. PDT


Red Flag Warning for 9pm Saturday to 8 AM on Monday.

The National Weather Service in San Francisco has upgraded their Fire Weather Watch to a Red Flag Warning for 9 PM Saturday to 8 AM PDT Monday.

* WIND...Northeast winds 15 to 25 mph Saturday Night into early Sunday morning with gusts from 35 to 50 mph likely in the hills above 1000 feet. Winds will ease during the daylight hours of Sunday but then another burst of offshore winds will develop Sunday night into Monday morning. The winds on Sunday night will be almost purely offshore from an easterly direction.

* HUMIDITY...Humidity 30-45% Saturday evening will dry out overnight as offshore winds develop to less than 30% by sunrise Sunday. RH values staying steady from 10-25% Sunday into early Monday with no humidity recovery Sunday night.

* HIGHEST THREAT...The hills of northeast Sonoma county and Napa county above 1000 feet. Strongest winds near Mount Saint Helena as well as Mount Tamalpais in Marin county. Persistent offshore winds will reach all the way to the coast Sunday night so coastal Sonoma county including the Wallbridge and Woodward fire in Point Reyes will feel the effects of the drying offshore winds.

* IMPACTS...Any fires that develop will spread rapidly in the hot, dry and windy weather.

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.

Napa County OES
1195 3rd St
Napa, CA 94559

Emergency: 9-1-1
Non-emergencies: 707-299-1892

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