NWS Tiyan GUSU.W 0009October 16, 2026
High Surf Warning: Guam, Rota, Tinian and 1 more, GU and MP
The National Weather Service office in Tiyan issued a high surf warning for Guam, Rota, Tinian and 1 more in Guam, Northern Mariana Islands, in force until 4:00 a.m. local time on October 19. It was the 9th high surf warning the NWS office in Tiyan issued in 2026.
Warning
In force for 35 hours
The notice
- Issued by
- National Weather Service, Tiyan GU
- Area
- Guam, Rota, Tinian and 1 more
- State
- Guam
- Level
- Warning
- Issued
- 3:12 p.m. UTC+10, October 16, 2026
- In force from
- 5:00 p.m. UTC+10, October 17, 2026
- Expires
- 4:00 a.m. UTC+10, October 19, 2026
- CAP severity, certainty, urgency
- Moderate, Likely, Expected
- VTEC event
- PGUM SU.W 0009
- Official source
- National Weather Service: the notice at its source
Every warning type in GuamHigh Surf Warning: what it means, and the states that get the most
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
* WHAT...For the High Surf Warning, dangerously large breaking waves of 7 to 9 feet Saturday afternoon, building to as high as 26 feet for Guam, 20 feet for Rota and 19 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 south facing reefs through Sunday afternoon. For the Coastal Flood Watch, 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 up to 5 feet for Guam, 2 to 4 feet for Rota and 1 to 3 feet for Tinian and Saipan is possible. Coastal flooding and beach erosion is possible. * 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.
What the agency told people to do
Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.