Special Marine Warning for Mona Passage Southward to 17N
This alert is no longer in effect.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 San Juan PR has issued a Special Marine Warning for the Mona Passage due to a severe thunderstorm capable of producing waterspouts until 3:45 PM AST.
Read this weather record in 30 seconds
- Record type
- Special Marine Warning
- Affected area
- Mona Passage Southward to 17N
- Issued
- August 19, 2026
- Issuing authority
- NWS San Juan PR
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 Mona Passage Southward to 17N.
Alert Details
Special Marine Warning issued by NWS San Juan PR. Effective from 2:50 PM AST August 19, 2026 until 3:45 PM AST August 19, 2026. Severity: Severe. Urgency: Immediate. Certainty: Likely.
Affected Areas
Mona Passage Southward to 17N (AMZ741).
What You Should Do
Move to safe harbor immediately as gusty winds and high waves are expected. Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects. Report severe weather to the Coast Guard or the National Weather Service.
Expected Conditions
At 2:49 PM AST, a severe thunderstorm capable of producing waterspouts was located over the Mona Passage, moving west at 10 knots. Hazard: Waterspouts and wind gusts 34 knots or greater. The severe thunderstorm will remain over mainly open waters.
Timeline
Alert effective August 19, 2026 at 2:50 PM AST. Expires August 19, 2026 at 3:45 PM AST.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
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 (1,102 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 19, 2026.
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Common questions about this NWS weather alert.