NEW: Flood watches have been upgraded to flood warnings in areas of Alameda, San Mateo and Santa Clara counties, according to the National Weather Service. Sonoma County flood warning still in effect until 10:30 a.m.
An atmospheric river storm will bring moderate-to-heavy rain through Saturday, resulting in the rapid rise of rivers, streams and creeks, according to the National Weather Service, which has issued widespread flood warnings, advisories and watches across the region.
An atmospheric river storm arrived in the Bay Area overnight Saturday, bringing heavy rain and widespread flood watches to some areas. Vianey Arana and Cinthia Pimentel have your Microclimate Forecast.Sign up for NBC Bay Area’s Housing Deconstructed newsletter.View the graphics below to get a sense of how the atmospheric river will roll through the Bay Area on Friday and Saturday.Projected look at how the storm rolls into the Bay Area on Saturday.
Higher rain rates per hour and gusty wind will increase by Friday afternoon into Saturday morning. Early Saturday should be the storm at peak intensity with localized flooding along creeks and streams. Roadway flooding is likely into midday Saturday. We're expecting a break from the rain for New Year's Day on Sunday before more rain returns on Monday.