GUAM; ROTA; TINIAN; SAIPAN — * WHAT...For the High Surf Warning, large, hazardous breaking waves of 7 to 9 feet Saturday afternoon will become dangerous, building to as high as 35 feet for Guam, 25 feet for Rota and 20 feet for Tinian and Saipan. For the Coastal Flood Watch, significant coastal flooding possible.
* WHERE...For the High Surf Warning, initially east facing reefs of Guam, Rota, Tinian, and Saipan; spreading to all reefs through Sunday afternoon. The Coastal Flood Watch is also for all reefs of the Marianas.
* WHEN...For the High Surf Warning, from 5 PM Saturday to 4 AM ChST Monday. For the Coastal Flood Watch, from Saturday afternoon through late Sunday night.
* IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. Some shoreline erosion may 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. Coastal inundation of 5 to 7 feet for Guam, 2 to 4 feet for Rota and 1 to 3 feet for Tinian and Saipan is possible along with coastal flooding and beach erosion.
* ADDITIONAL DETAILS...As TS Champi approaches the Marianas, surf conditions are expected to deteriorate rapidly, with surf reaching 9 feet Saturday afternoon, building to dangerous/deadly levels through Saturday night.
Flooding in Guam; Rota; Tinian; Saipan can cut off roads with little warning, damage homes near low-lying areas, and disrupt power and water service. Even a few inches of moving water can carry away a vehicle.
This report is based on information from NWS, monitored by Alert USA's verified emergency feed.
Alert USA anticipates a high chance of travel disruptions, elevated property risk in low-lying areas, and possible power outages while the event is active.
Recommended steps: avoid flooded roads — turn around, don't drown; move to higher ground if you are in a low-lying area; charge phones and prepare for power loss; check on family and neighbors.
Alert USA is tracking this flood event and will update this report as verified information becomes available.
Verified by Alert USA • NWS