Alert USA
weather NWS moderate Guam Coastal Waters; Rota Coastal Waters October 18, 2026 at 7:53 AM

Hazardous Seas Warning

* WHAT...Very steep and hazardous seas 12 to 16 feet and southeast winds 20 to 30 kt with occasional gusts to 40 kt.

* WHERE...Guam and Rota Coastal Waters.

* WHEN...Until 5 PM ChST Monday.

* IMPACTS...Very steep and hazardous seas could capsize or cause damage to vessels.

* ADDITIONAL DETAILS...Typhoon and tropical storm conditions are no longer expected as Typhoon Champi continues moving away from the region. However, combined seas will be very steep due to remnant storm-induced swells and elevated wind waves. As Champi continues moving away at a relatively quick speed, seas could drop below 15 feet after midnight.

Local conditions in Guam Coastal Waters; Rota Coastal Waters may affect travel, public safety, or daily routines. Stay informed and adjust plans if conditions change.

This report is based on information from NWS, monitored by Alert USA's verified emergency feed.

Residents should be prepared for possible effects on travel, public safety, and daily routines while the situation remains active.

Recommended steps: stay informed via official sources; avoid non-essential travel in the area; secure outdoor items if weather is involved; check on family and neighbors.

Alert USA is tracking this developing situation and will update this report as verified information becomes available.

Verified by Alert USA • NWS

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