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Special Marine Warning issued October 18 at 6:26PM ChST until October 18 at 6:45PM ChST by NWS Tiyan GU, United States of America

Event time: Oct 18, 2026 08:28 UTC Last updated: 1 day ago United States

Icon = what happened · ring colour = how serious: Extreme Severe Moderate Minor

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SMWGUM

THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A

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

* UNTIL 645 PM CHST.

* AT 626 PM CHST...A SHOWER CAPABLE OF PRODUCING WATERSPOUTS WAS
LOCATED OVER SOUTHERN GUAM WATERS OF MOVING NORTH AT 30 KNOTS.

HAZARD...WATERSPOUTS AND WIND GUSTS 34 KNOTS OR GREATER.

SOURCE...RADAR.

IMPACT...WATERSPOUTS CAN CREATE LOCALLY HAZARDOUS SEAS. SMALL

CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND

SUDDENLY HIGHER WAVES.

* THE SHOWER WILL REMAIN OVER MAINLY OPEN WATERS.

Measurements

Coordinates	12.9660, 144.9320
Region	Guam Coastal Waters
Location Precision	polygon
Issuing Authority	United States of America — us-noaa-nws-en-marine
Cap Urgency	Immediate
Cap Certainty	Likely
Cap Expires	2026-10-18T18:45:00+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

This event as JSON · API and licence

Source updated 1 day ago (Oct 18, 2026 08:29 UTC) · we last heard from WMO Alert Hub (national weather services) 3 seconds ago

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Official authorities in United States

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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 issued September 18 at 12:15AM MDT until September 18 at 12:30AM MDT by NWS Albuquerque NM, United States of America Severe Severe Storm United States closed via WMO Sep 18, 2026 Severe Thunderstorm Warning issued September 17 at 11:41PM MDT until September 18 at 12:30AM MDT by NWS Albuquerque NM, United States of America Severe Severe Storm United States closed via WMO Sep 18, 2026 Severe Thunderstorm Warning issued September 17 at 11:23PM MDT until September 18 at 12:15AM MDT by NWS El Paso Tx/Santa Teresa NM, United States of America Severe Severe Storm United States closed via WMO Sep 18, 2026 Severe Thunderstorm Warning — Bannock, ID; Bingham, ID; Caribou, ID; Power, ID Severe Severe Storm United States closed via NWS Sep 18, 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 19 hr ago Special Marine Warning — Guam Coastal Waters; Rota Coastal Waters Severe Severe Storm United States active via NWS 20 hr ago Special Marine Warning — Guam Coastal Waters; Rota Coastal Waters Severe Severe Storm United States active via NWS 20 hr ago Special Marine Warning — Guam Coastal Waters; Rota Coastal Waters Severe Severe Storm United States active via NWS 21 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 21 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.