High Surf Warning issued October 18 at 12:00PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU
Official severe-weather alerts, warning areas, and disaster updates.
expired · active · official-source
* WHAT...For the Coastal Flood Warning, significant coastal flooding. For the High Surf Warning, dangerously large breaking waves of 18 to 24 feet in the surf zone. * WHERE...Guam and Rota. * WHEN...Until 4 AM ChST Monday. * IMPACTS...Low lying property including homes, businesses, and some critical infrastructure may still be inundated. Some shoreline erosion will 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. * ADDITIONAL DETAILS...South to southeast swells and elevated wind waves induced by Super Typhoon Champi to the west-southwest will continue life-threatening surf and significant coastal flooding at least through early Monday morning. Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure.
- Event time
- Source last updated
- Current version retrieved
- Provider
- NWS — active weather alerts (Storm)
- Location
- US
- Severity
- Moderate
- area
- Guam; Rota
- event
- High Surf Warning
- onset
- 2026-10-18T12:00:00+10:00
- states
- ["GU","MP"]
- urgency
- Expected
- certainty
- Likely
- effective
- 2026-10-18T12:00:00+10:00
- message id
- urn:oid:2.49.0.1.840.0.df1eac139d63bdf17a9b6aac1e2a573bfb896cb1.002.2
- references
- ["urn:oid:2.49.0.1.840.0.0e7432c5597c80a0ee84b9e5d0142f777255ff18.001.2"]
- instruction
- Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure.
- message type
- Update
- location basis
- Approximate: centers of the NWS zones listed in the alert
- freshness minutes
- 60
Source use policy · US government work (17 U.S.C. 105)
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Update history (2 recent revisions)
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