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King Tides Peak This Week as Supermoon Triggers Coastal Flood Alerts

An overlapping Bay Area storm elevates coastal flood risk with gusts forecast up to 65 mph during the highest tides of 2025.

Overview

  • The National Weather Service issued a coastal flood advisory for the San Francisco and Monterey bay shorelines through Saturday, with about 1.2 feet of inundation possible in low-lying areas.
  • A storm moving through the Bay Area is forecast to bring inches of rain in the North Bay and winds up to 50 mph in San Francisco with 65 mph gusts in higher elevations, raising the risk of roadway flooding.
  • Boston Harbor is expected to see several high-tide cycles over 12 feet from Wednesday through Saturday, with minor splashover possible late in the week depending on wind direction.
  • Forecasters expect water levels to run 1 to 3 feet above normal in parts of Florida and the Southeast, with Port Everglades about a foot higher than non–king-tide months and local coastal flood statements in effect.
  • Agencies warn of dangerous sneaker waves and potential beach access closures along the Pacific Northwest, and note that sea level rise will make tidal flooding more frequent even without storms.