San Francisco residents should brace for a significant change in weather as a potent cold front approaches the region, expected to unleash widespread rain, gusty winds, and even potential thunderstorms Sunday night into Monday. The National Weather Service in San Francisco cautions that this system will not only dampen the start of the week but could also lead to nuisance flooding. Commuters are advised to allow extra time on Monday morning and avoid flooded roadways.
The first bout of light rain is predicted to subside Sunday morning across the southern Bay Area and Central Coast, but don’t get too comfortable – the next system looms just on the horizon. "Widespread light, stratiform rain continues across the southern Bay Area and Central Coast with around 0.5-1.0" having fallen with this system so far," noted the National Weather Service in their Area Forecast Discussion. Following a brief afternoon reprieve, the incoming system associated with a strong surface cold front is forecasted to drop an additional 1-2" of rain in some areas.
With the ground already saturated from previous downpours, the Bay Area and Central Coast are at increased risk for surface runoff and flooding. "Soils are either saturated or close to saturation which increases surface runoff and, consequently, the risk of nuisance flooding," the National Weather Service reported. They emphasize the importance of seeking alternative routes rather than risking passage through flooded areas.
Wind conditions will also intensify in the evening, with forecasted gusts hitting the 30 to 35 mph mark, and potentially even stronger over higher terrain and mountain passes. As the front sweeps through, there's also a 20-25% chance of thunderstorms. Travel by sea will also be rough, as moderate to gale-force gusts and heavy rain are expected to lead to hazardous marine conditions. "There is also a good chance for thunderstorms as the front moves through," the National Weather Service warns, prompting concerns for those out on the waters. From Tuesday onwards, a general clearing is anticipated before another, albeit weaker, system arrives on Thursday.
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