This alert expired on 30 August 2026 at 17:30 UTC. It is kept here as a record.
What the source measured
NOAA reported: Special Marine Warning issued August 30 at 12:40PM AST until August 30 at 1:30PM AST by NWS San Juan PR
An estimated 264,364 people live within 50 km of this point.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 82% |
| Coordinates | 17.9121, -66.3321 |
| Nearest City | Guayama (25 km) |
| Population Exposed | 264.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T16:40:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Caribbean Waters of Puerto Rico from 10 NM to 17N, including the Coastal Waters of Saint Croix; Coastal Waters of Southern Puerto Rico out 10 NM |
| Headline | Special Marine Warning issued August 30 at 12:40PM AST until August 30 at 1:30PM AST by NWS San Juan PR |
| Expires | 2026-08-30T13:30:00-04:00 |
| SenderName | NWS San Juan PR |
| HasExactCoords | true |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 43/100, near Guayama (Puerto Rico), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.