Severe Severe Storm ● Closed

Special Marine Warning issued September 19 at 9:11PM ChST until September 19 at 9:45PM ChST by NWS Tiyan GU, United States of America

Event time: Last updated: Sep 28, 2026 United States
Icon = what happened · ring colour = how serious: Extreme Severe Moderate Minor

Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.

SMWGUM

THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
GUAM COASTAL WATERS...

* UNTIL 945 PM CHST.

* AT 911 PM CHST...STRONG THUNDERSTORMS WERE LOCATED OVER THE WEST
COAST OF GUAM...MOVING EAST AT 10 KNOTS.

HAZARD...WIND GUSTS 34 KNOTS OR GREATER. FREQUENT LIGHTNING

SOURCE...RADAR.

IMPACT...SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND
SUDDENLY HIGHER WAVES.

* STRONG THUNDERSTORMS WILL REMAIN OVER MAINLY OPEN WATERS.

Measurements

Coordinates13.3700, 144.5813
RegionGuam Coastal Waters
Location Precisionpolygon
Issuing AuthorityUnited States of America — us-noaa-nws-en-marine
Cap UrgencyImmediate
Cap CertaintyLikely
Cap Expires2026-09-19T21:45:00+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 report

Also reported by: NWS

This event as JSON · API and licence

Source updated 30 days ago (Sep 19, 2026 11:13 UTC) · we last heard from WMO Alert Hub (national weather services) 50 seconds ago

On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.

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 →

Earlier severe storm 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.

Severe Thunderstorm Warning — Wayne, KY Severe Severe Storm United States closed via NWS Aug 20, 2026 Severe Thunderstorm Warning — Wayne, KY Severe Severe Storm United States closed via NWS Aug 20, 2026 Severe Thunderstorm Warning — La Paz, AZ Severe Severe Storm United States closed via NWS Aug 20, 2026 Severe Thunderstorm Warning — Calloway, KY Severe Severe Storm United States closed via NWS Aug 20, 2026

Nearby & related events

Special Weather Statement issued October 19 at 12:01PM ChST by NWS Tiyan GU, United States of America Moderate Extreme Weather United States active via WMO 17 hr ago Special Marine Warning — Guam Coastal Waters; Rota Coastal Waters Severe Severe Storm United States active via NWS 18 hr ago Special Marine Warning — Guam Coastal Waters; Rota Coastal Waters Severe Severe Storm United States active via NWS 18 hr ago Special Marine Warning — Guam Coastal Waters; Rota Coastal Waters Severe Severe Storm United States active via NWS 19 hr ago Special Weather Statement issued October 19 at 10:34AM ChST by NWS Tiyan GU, United States of America Moderate Extreme Weather United States active via WMO 19 hr ago

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.