Big changes in the Bay Area weather pattern! A potent system will drift down the coast Monday, bringing rain, thunderstorms, and gusty winds. Rain is expected to pick up mid morning Monday. Rainfall, possibly, heavy at times, will move over the entire Bay Area by noon, Heads up for the Sierra! A Winter Storm Warning will be in effect for the West Slopes of the Sierra. Showers and thunderstorm chances remain in the Tuesday forecast.

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