Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 12 September 2026 at 18:45 UTC. It is kept here as a record.
It is the 7th strongest of the 41 detections recorded within 20 km of this point since 25 March 2026. The last comparable one was on 7 September 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued September 12 at 2:10PM AST until September 12 at 2:45PM AST by NWS San Juan PR
An estimated 109,445 people live within 50 km of this point.
Nearby, since 25 March 2026
- June 29, 2026 · score 43 · 3.1 km
- May 23, 2026 · score 43 · 13.1 km
- August 9, 2026 · score 43 · 13.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 81% |
| Coordinates | 18.1395, -67.2165 |
| Nearest City | Mayagüez (11 km) |
| Population Exposed | 109.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-12T18:10:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.343835fb9bd8c3f10533b55f36ad4f5a957fded5.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Mona Passage Southward to 17N; Coastal Waters OF Northwestern Puerto Rico out 10 NM; Coastal Waters OF Southwestern Puerto Rico out 10 NM |
| Headline | Special Marine Warning issued September 12 at 2:10PM AST until September 12 at 2:45PM AST by NWS San Juan PR |
| Expires | 2026-09-12T14:45:00-04:00 |
| 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 8 March 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.
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