National Weather Service United States Department of Commerce
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Last Map Update: Fri, Sep. 17, 2021 at 9:38:13 pm PDT

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National Weather Service Sacramento, CA
National Weather Service Honolulu, HINational Weather Service San Francisco Bay Area, CA

A very typical early Autumn offshore flow event is set to impact interior northwest California beginning Sunday night and continuing into Monday. Less typical will be rains preceding it, which will soak much of Mendocino County, and especially areas farther north and west Saturday and Saturday night. However, less than a tenth of an inch is expected over much of southern and eastern Lake County. As high pressure builds quickly in to our north and northeast Sunday night into Monday, winds will shift from northwesterly to northeasterly Sunday night, remaining elevated especially over exposed higher slopes and ridges overnight and into Monday, which will bring in much drier air, followed by a hotter and drier day on Monday. This will especially be the case around Lake County, where vegetation and fuels will still be very dry. Winds will be lighter on Monday night, but very poor recoveries will remain over the ridges.
Rain is expected starting Saturday morning and spreading south across the area quickly through the day. A few lingering showers are possible on Sunday. After a long period of dry conditions it's very important for those traveling to use extra caution when encountering the first rainfall.

 

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