The National Weather Service is calling for a 90 percent chance of showers today in Pleasanton and the Tri-Valley with as much as 1 inch of rain expected. Afternoon temperatures are likely to reach no more than 56 degrees.
A wind advisory is in effect throughout the Bay Area until about 8 p.m. tonight. Winds of 25 to 35 mph are expected to be sustained throughout the region, with gusts of up to 50 mph possible in some areas.
Areas at elevations above 1,500 feet and areas along the coast are especially susceptible to the inclement weather. Drivers are encouraged to use extra caution, and residents should be aware of possible downed trees and sporadic power outages.
Alameda, Contra Costa, San Francisco, Santa Cruz, San Mateo, Marin, Monterey, Napa, Sonoma and Santa Clara counties are affected.
Tonight, there's a 70 percent chance that showers will continue in the Tri-Valley with thunder possible. A low temperature of 37 degrees is expected.
For Monday, the National Weather Service is calling for more showers with isolated thunderstorms and even small hail possible. Temperatures should hover in the mid to upper 50s with south winds of 15 to 20 mph. The chance of rain is 70 percent with up to a quarter-inch of accumulation.