Severe Storm Surge ● Active
Coastal Flood Warning issued October 18 at 12:00PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU, United States of America
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
* 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.
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | Guam; Rota |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Expected |
| Cap Certainty | Likely |
| Cap Expires | 2026-10-19T02:00:00+10:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportThis event as JSON · API and licence
Source updated 1 day ago (Oct 18, 2026 02:01 UTC) · we last heard from WMO Alert Hub (national weather services) 1 minute ago
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About this location
The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.
Area as the agency stated it: Guam; Rota
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →What to do
Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.
Understanding surge zones, evacuation timing, and why storm surge is the deadliest part of a tropical cyclone.
Open Storm Surge Safety Guide →Earlier storm surge events in United States
Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.
Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.