Special Marine Warning Issued for Guam and Rota Coastal Waters
This alert is no longer in effect.
NOAA issued it on August 19, 2026, 4 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Tiyan GU has issued a Special Marine Warning for Guam Coastal Waters and Rota Coastal Waters until 3:00 PM ChST due to severe thunderstorms capable of producing waterspouts.
Read this weather record in 30 seconds
- Record type
- Special Marine Warning
- Affected area
- Guam and Rota Coastal Waters
- Issued
- August 19, 2026
- Issuing authority
- NWS Tiyan GU
Marine notices apply to named waters or shoreline zones. They may not describe conditions on land, even when the nearest place name is the same.
Record status: historical. It was issued 4 days ago; use the issuing agency's live warning service for current conditions in Guam and Rota Coastal Waters.
Alert Details
A Special Marine Warning was issued by the National Weather Service in Tiyan GU (NWS Tiyan GU) at 2:20 PM ChST on August 19, 2026. The alert is effective immediately and expires at 3:00 PM ChST on August 19, 2026.
Affected Areas
The warning covers Guam Coastal Waters and Rota Coastal Waters. Impacted locations include areas along a line from 27 NM east of Ipan Buoy to 19 NM northeast of Ritidian Buoy.
What You Should Do
Boaters should move to safe harbor immediately until the hazardous weather passes. Seek safe harbor until these storms pass.
Expected Conditions
Severe thunderstorms capable of producing waterspouts are moving west at 40 knots. Hazards include waterspouts and wind gusts to 40 knots. Radar indicated the source of the alert.
Timeline
The alert is in effect from 2:20 PM ChST until 3:00 PM ChST on August 19, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (870 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 19, 2026.
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