Special Marine Warning Issued for Guam Coastal Waters Due to Potential Waterspouts
This alert is no longer in effect.
NOAA issued it on April 6, 2026, 4 months 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).
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The National Weather Service has issued a Special Marine Warning for Guam coastal waters until 7:45 AM ChST as showers capable of producing waterspouts move through the region.
Read this weather record in 30 seconds
- Record type
- Special Marine Warning
- Affected area
- Guam Coastal Waters
- Issued
- April 6, 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 months ago; use the issuing agency's live warning service for current conditions in Guam Coastal Waters.
Alert Details
The National Weather Service in Tiyan, Guam, has issued a Special Marine Warning for the Guam coastal waters. The alert was triggered at 7:01 AM ChST on March 2, 2026, after radar indicated showers capable of producing waterspouts in the area.
Affected Areas
The warning covers the Guam Coastal Waters. Specific activity was located 10 miles northwest of Ritidian and 5 miles northeast of Ritidian at the time of issuance.
What You Should Do
Mariners are urged to seek safe harbor immediately. Waterspouts can easily overturn boats and create locally hazardous seas. The NWS advises all craft to avoid the affected waters and remain in a secure location until the warning expires.
Expected Conditions
Showers capable of producing waterspouts were detected moving southwest at 15 knots. According to the National Weather Service, these showers are expected to remain mainly over open waters. The primary hazard identified is the formation of waterspouts, which can result in sudden and dangerous sea conditions.
Timeline
The Special Marine Warning is effective as of 7:01 AM ChST and is currently set to expire at 7:45 AM ChST on March 2, 2026.
Original source: NOAA Official Notice ↗
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