Coastal Flood Warning Issued from San Francisco to San Diego: Significant Flooding Expected Through Thursday

• by Shimanta Das
• October 28, 2026

A coastal flood warning remains in effect from San Francisco to San Diego until 1 PM PDT Thursday, as the National Weather Service (NWS) warns of significant coastal flooding across the region. The warning, issued by NWS San Diego CA, highlights the potential for low-lying property including homes, businesses, and some critical infrastructure to be inundated. Residents and visitors along the California coast are urged to take precautions and stay informed as the situation develops.

According to the NWS, significant coastal flooding is expected during this period, particularly during high tide cycles. The combination of astronomical high tides and elevated surf will likely cause water to spill into areas that normally remain dry. The warning emphasizes that low-lying property including homes, businesses, and some critical infrastructure will be inundated, posing a risk to life and property. The FOX Forecast Center adds that residents should expect significant beach erosion, higher-than-average surf, and flooding of parking lots and roads. These conditions could make travel hazardous and lead to road closures in affected areas.

The coastal flood warning covers a vast stretch of the California coastline, from the Bay Area down to the Mexico border. Coastal communities should prepare for potential impacts, including flooded streets, overwhelmed drainage systems, and damage to coastal structures. The warning remains in effect through Thursday afternoon, and conditions may worsen during peak tide times. Authorities advise avoiding flooded areas and never driving through water-covered roads, as the depth and current can be deceptive and dangerous.

Residents are encouraged to monitor local forecasts and heed any evacuation orders or advisories from local officials. Significant coastal flooding expected means that even areas not typically prone to flooding could see water intrusion. Stay tuned to official channels for updates and be prepared to take action if necessary. As the warning remains in effect until 1 PM PDT Thursday, it is crucial to remain vigilant and prioritize safety for yourself and your community.