Headline:
High Surf Warning issued October 16 at 10:48PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU
Event:
High Surf Warning
Urgency:
Expected
Effective:
October 16, 2026 - 5:48am
Expires:
October 16, 2026 - 5:30pm
Description:
* 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.
Instruction:
Everyone should remain out of the water due to life-threatening
surf conditions. Stay off of jetties, piers, and other waterside
infrastructure.
Area Description:
Guam; Rota; Tinian; Saipan
Forcast Office:
NWS Tiyan GU
Sender:
w-nws.webmaster@noaa.gov