Weather Alerts For Castro Valley, CA

Flood Advisory National Weather Service San Francisco CA 837 AM PST Mon Dec 22 2025 Alameda CA-Contra Costa CA- 837 AM PST Mon Dec 22 2025 ...FLOOD ADVISORY IN EFFECT UNTIL 1130 AM PST THIS MORNING... * WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Western Alameda County in northern California... Western Contra Costa County in northern California... * Until 1130 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 837 AM PST, Doppler radar indicated moderate to heavy rain at times. This will cause urban and small stream flooding. Overflowing poor drainage areas will cause minor flooding in the advisory area. - Some locations that will experience flooding include... Oakland, Fremont, Hayward, Concord, Berkeley, Richmond, San Leandro, Livermore, Mountain View, Alameda, San Ramon, Pleasanton, Union City, Walnut Creek, Dublin, Newark, Danville, Martinez, Pleasant Hill and San Pablo. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. &&

URGENT - WEATHER MESSAGE National Weather Service San Francisco CA 435 AM PST Mon Dec 22 2025 San Francisco-Marin Coastal Range-Sonoma Coastal Range-North Bay Interior Mountains-Coastal North Bay Including Point Reyes National Seashore-North Bay Interior Valleys-San Francisco Bay Shoreline-San Francisco Peninsula Coast-East Bay Interior Valleys- Santa Cruz Mountains-Santa Clara Valley Including San Jose- Eastern Santa Clara Hills-East Bay Hills-Southern Salinas Valley/Arroyo Seco and Lake San Antonio-Santa Lucia Mountains and Los Padres National Forest-Mountains of San Benito County And Interior Monterey County including Pinnacles National Park- Northern Salinas Valley/Hollister Valley and Carmel Valley- Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast- 435 AM PST Mon Dec 22 2025 ...HIGH WIND WATCH REMAINS IN EFFECT FROM TUESDAY EVENING THROUGH EARLY WEDNESDAY MORNING... * WHAT...South winds 20 to 30 mph with gusts up to 60 mph possible. * WHERE...The Bay Area, The Central Coast, The Santa Clara Valley and Eastern Hills, The Salinas and Carmel Valleys and Hollister Area, The Santa Cruz Mountains, and San Francisco Peninsula Coast. * WHEN...From Tuesday evening through early Wednesday morning. * IMPACTS...Damaging winds could down trees, snap power lines, and result in property damage. Widespread power outages are possible. Travel could be extremely difficult and hazardous, especially for high profile vehicles. The combination of wind and moist soils will increase the risk for downed trees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts and warnings for updates. Secure loose outdoor objects that could be blown around or damaged by the wind. &&

URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 334 AM PST Mon Dec 22 2025 San Francisco-San Francisco Bay Shoreline-San Francisco Peninsula Coast-East Bay Interior Valleys-Santa Cruz Mountains-Santa Clara Valley Including San Jose-Eastern Santa Clara Hills-East Bay Hills-Southern Salinas Valley/Arroyo Seco and Lake San Antonio- Santa Lucia Mountains and Los Padres National Forest-Mountains of San Benito County And Interior Monterey County including Pinnacles National Park-Northern Salinas Valley/Hollister Valley and Carmel Valley-Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast- Including the cities of Seaside, Daly City, Pittsburg, Oakland, Hayward, Fremont, Scotts Valley, Monterey, San Francisco, Greenfield, San Ramon, Concord, Livermore, Berkeley, San Jose, Live Oak, Pleasanton, Marina, Watsonville, Salinas, Santa Cruz, Antioch, Cordoza Ridge, Boulder Creek, Pacifica, Blackhawk, King City, Walnut Creek, and Day Valley 334 AM PST Mon Dec 22 2025 ...FLOOD WATCH IN EFFECT FROM TUESDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...San Francisco County, San Mateo Peninsula, East Bay, South Bay, and Central Coast * WHEN...From Tuesday morning through Friday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A series of atmospheric rivers will result in multiple rounds of moderate to heavy rainfall this week across the Bay Area and Central Coast. An additional 2-4" of rain is expected across the interior with locally higher totals between 4-6" across the Santa Cruz Mountains and up to 8" across the Santa Lucia Range. Flooding potential will increase with each successive round of rain. Sharp rises in smaller creeks and streams are expected with at least some potential for minor flooding in mainstream rivers. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. &&