Heavy rain was moving toward San Francisco on Sunday evening, setting the stage for potential flooding overnight into Monday morning.
It was a shift from earlier forecasts that indicated the heaviest rain would be focused south and east of the city. But the cold front was moving slower than anticipated, meaning downpours could stall over the same area and cause flooding.
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High resolution weather models predicted rainfall rates up to a half-inch per hour over portions of Marin, Sonoma, Napa, San Mateo and San Francisco counties Sunday night. Western Alameda and Contra Costa counties could also be drenched by heavy rain.
“Highly localized rates around 0.75 (inches per hour) along the immediate coast” were possible, the National Weather Service said in an excessive rainfall forecast. “These rainfall amounts will result in isolated flood impacts through the overnight hours, especially across more susceptible urban areas.”…