San Franciscans can expect the weather to take a cool and damp turn as the weekend approaches. According to an early morning forecast issued by the National Weather Service San Francisco, the city and surrounding areas will see "increasing cloud cover and cooler temperatures," with a rain front moving in late Friday night. The rain is predicted to continue through Saturday, particularly impacting the North Bay Hills and Valleys, which could receive up to half an inch of rain. In contrast, the Bay Area and East Bay Hills are forecasted to experience lighter rainfall.
The marine layer is set to significantly beef up, bringing coastal stratus along with patches of fog and drizzle. Today's temperatures should stay relatively normal, but the approaching upper-level low will make for a cooler, wetter Friday night and Saturday. The weather system is slated to shift north as it comes inland, which might mean variations in the expected rainfall across different areas.
The long-term forecast hints at an "active longwave synoptic pattern," according to the NWS San Francisco. This means after the upper-level low passes, the region is expected to see a rise in temperatures from Sunday to Tuesday. There's a silver lining for those longing for more rain: forecasters see a potential for more widespread rainfall by mid-next week, though they're holding out for a consensus among predictive models before making a firm call.
Aviation conditions are abruptly changing over the next few days, with LIFR conditions and fog expected for Monterey Bay until late morning today. According to the NWS 12Z TAFs, SFO should retain VFR conditions for the duration, with winds strengthening in the afternoon but easing by the evening. Mariners, meanwhile, will be pleased with the calm seas and lighter winds that are anticipated to last into the next week. This Saturday, the incoming weather system may only bring "locally breezy conditions" to Northern waters, according to NWS San Francisco.
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