Guam, Northern Mariana Islands Coastal Flood Warning | Effective 04/15/2026 22:50

* WHAT...For the Coastal Flood Warning, significant coastal flooding of 2 to 3 feet. For the High Surf Warning, dangerously large breaking waves of 12 to 19 feet. For the Coastal Flood Advisory, minor coastal flooding of 1 to 2 feet expected. For the High Surf Advisory, large breaking waves of 10 to 14 feet expected. For the High Rip Current Risk, dangerous rip currents. * WHERE...South, west and north facing reefs and shorelines of Guam and Rota. * WHEN...For the Coastal Flood Warning, until 5 PM ChST this afternoon. For the High Surf Warning, until 5 PM ChST Friday. For the Coastal Flood Advisory, from 5 PM this afternoon to 5 PM ChST Saturday. For the High Surf Advisory, from 5 PM Friday to 5 PM ChST Saturday. For the High Rip Current Risk, through Saturday afternoon. * IMPACTS...Some roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and significant beach erosion can be expected. Rip currents can sweep even the best swimmers away from shore into deeper water. * ADDITIONAL DETAILS...As TY Sinlaku continues to move away and wind driven waves decrease, the primary swell and highest surf will be southwest. Seas will be slow to subside over the next couple of days. Surf heights of 12 to 17 feet are expected for Guam and 13 to 19 feet for Rota.