Guam, Northern Mariana Islands Severe Coastal Flood Warning | Effective 07/05/2026 04:02

* WHAT...For the Coastal Flood Warning, significant coastal flooding. For the High Surf Warning, dangerously large breaking waves of 25 to 35 feet in the surf zone. * WHERE...Guam, Rota, Tinian and Saipan. * WHEN...For the Coastal Flood Warning, until 4 PM ChST Wednesday. For the High Surf Warning, until 4 PM ChST Thursday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Significant shoreline erosion will occur. Waters will be deadly. * ADDITIONAL DETAILS...Hazardous surf levels will rapidly build to dangerous levels along north, east, and south facing reefs this evening as Super Typhoon Bavi approaches the Marianas from the east and tropical storm force conditions develop, spreading to west facing reefs soon after. Surf will potentially build to 35 feet Monday morning near Rota and 30 feet elsewhere as Bavi makes its passage through the islands likely as a Category 5 Super Typhoon. Coastal inundation will become likely this evening, During the passage of Bavi, coastal inundation could approach 12 feet, especially near the storm center due to the dome effect. Once Bavi exits to the west-northwest by Tuesday, coastal inundation and erosion is likely to increase along west facing shores while easing elsewhere.