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   Daniel Swain (weatherwest@mastodon.social)'s status on Tuesday, 04-Feb-2025 17:21:38 JST Daniel Swain

   The warm, moist, and slow-moving atmospheric river has lifted back northward (temporarily, and as expected) as a frontal wave causes a classic "windshield wiper effect" over NorCal. But heavier rain is now moving back southward as cold front approaches... #CAwx #CAwater

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     Daniel Swain (weatherwest@mastodon.social)'s status on Tuesday, 04-Feb-2025 17:21:37 JST Daniel Swain

     in reply to

     On Tue, a modest surface low will spin up offshore west of San Francisco. This will induce "frontogenesis" (cold frontal strengthening) as the system approaches the Bay Area--likely resulting in a "sporty" cold frontal passage in portions of northern/central CA. #CAwx

     Steve's Place repeated this.
   • Embed this notice
     Daniel Swain (weatherwest@mastodon.social)'s status on Tuesday, 04-Feb-2025 17:21:37 JST Daniel Swain

     in reply to

     Tomorrow's SF Bay Area rainfall will feature much heavier downpours and even (briefly) torrential ones, with some urban/creek flooding possible. Isolated thunderstorms, some stronger and possibly containing very gusty winds and intense convective downpours, are also likely. #CAwx