Look for the umbrella

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.