A fast-moving storm system is bringing widespread rain and a chance of thunderstorms to the Bay Area on Monday, with showers pushing south from the North Bay through the morning and intensifying by early afternoon.

The National Weather Service said in its daily forecast discussion that rainfall will increase in coverage and intensity through the afternoon and into the evening, combined with wind gusts of up to 35 mph in higher terrain, and up to 45 mph in the higher terrains of the Central Coast.

A flash flood warning was in effect for several hours Monday afternoon in a portion of Napa County where the Pickett Fire burned in late August and early September. Meanwhile, flood advisories were issued for most other Bay Area counties until later Monday evening.

Earlier, the Weather S

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