Weather Alerts For Castro Valley, CA

# HEADLINE -------------------- COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST FRIDAY # DETAILS -------------------- WHAT Up to 1.5 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. WHERE North Bay Interior Valleys and San Francisco Bay Shoreline. WHEN Until 4 PM Friday. IMPACTS High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. ADDITIONAL DETAILS At the San Francisco tide gauge, high tide is expected to be: 1.3 ft above normal (7.1 ft MLLW) at 12:10 PM Thursday 11/12, 1.5 ft above normal (7.3 ft MLLW) at 12:49 PM Friday 11/13. These predictions include up to 1.8 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively. ISSUED AT Wednesday, November 11, 2026 at 10:48 PM PST ISSUED BY National Weather Service San Francisco CA HEADER Coastal Hazard Message # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. # AREAS AFFECTED -------------------- North Bay Interior Valleys, San Francisco Bay Shoreline