This alert expired on 12 May 2026 at 10:30 UTC. It is kept here as a record.
It is the 15th strongest of the 23 detections recorded within 20 km of this point since 11 May 2026. The last comparable one was on 11 May 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 12 at 5:27AM EDT until May 12 at 6:30AM EDT by NWS Jacksonville FL
An estimated 78,483 people live within 50 km of this point.
Nearby, since 11 May 2026
- June 18, 2026 · score 39 · 13.1 km
- July 26, 2026 · score 39 · 13.6 km
- May 28, 2026 · score 43 · 13.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 82% |
| Coordinates | 30.3025, -81.0175 |
| Nearest City | Jacksonville Beach (36 km) |
| Population Exposed | 78.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-12T09:27:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.bc9133e051a50d53055e8e6572d1d0d9 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM; Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM |
| Headline | Special Marine Warning issued May 12 at 5:27AM EDT until May 12 at 6:30AM EDT by NWS Jacksonville FL |
| Expires | 2026-05-12T06:30:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.bc9133e051a50d53055e8e6572d1d0d926c65c7e.001.1","noaa_urn:oid:2.49.0.1.840.0.0a0fd478a5714f935af4c0a5689b41b2ed969e66.001.1"] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 39/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.