"The National Weather Service is making no promises the forecast is currently "low to moderate confidence" but the agency says that a low pressure system is moving down from Alaska and should be impacting the West Coast with rain by Friday, likely starting in the North Bay. The storm system is being called an atmospheric river, and meteorologists say that parts of Northern California and the southern Oregon coast are the most likely to see heavy rainfall by the weekend."
"Next chance for rainfall arrives Friday into the weekend with a low pressure system moving into the West Coast. Generally beneficial rainfall is likely with the greatest impacts across the North Bay. Forecast is low to moderate confidence and will evolve -- stay tuned! #CAwx pic.twitter.com/dA7fcqF1jy NWS Bay Area (@NWSBayArea) October 20, 2025 As the Reno Gazette-Journal reports, heavy snow is possible in the Sierra, potentially hitting Donner Pass late in the weekend."
A low pressure system moving down from Alaska is expected to reach the West Coast by Friday and may produce an atmospheric river over Northern California and the southern Oregon coast. Forecast confidence is low to moderate and details will evolve. The greatest rainfall impacts are likely across the North Bay, while Del Norte County could see up to three inches. Mendocino and Lake counties have only about a 30% chance of heavy rainfall. The Sierra may receive heavy snow, possibly at Donner Pass, or western Nevada could get the heaviest precipitation if the storm tracks north. AccuWeather shows limited rain in San Francisco through Saturday.
Read at sfist.com
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