Northern Mariana Islands High Surf Warning | Effective 04/16/2026 16:34

* WHAT...For the Coastal Flood Warning, significant coastal flooding of 4 to 6 feet. For the High Surf Warning, dangerously large breaking waves of 13 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 Tinian and Saipan. * WHEN...For the Coastal Flood Warning, until 5 AM ChST Saturday. For the High Surf Warning, until 10 AM ChST Saturday. For the Coastal Flood Advisory, from 5 AM Saturday to 11 AM ChST Sunday. For the High Surf Advisory, from 10 AM Saturday to 5 PM ChST Sunday. For the High Rip Current Risk, through Sunday afternoon. * IMPACTS...Numerous 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 Typhoon Sinlaku continues to move away and wind driven waves decrease, the primary swell and highest surf will become southwest. Seas will be slow to subside over the next couple of days.