This alert expired on 12 May 2026 at 10:45 UTC. It is kept here as a record.
It is the 8th strongest of the 16 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 12 at 5:39AM EDT until May 12 at 6:45AM EDT by NWS Jacksonville FL
An estimated 20,019 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 15, 2026 · score 39 · 14.0 km
- July 13, 2026 · score 22 · 19.3 km
- May 12, 2026 · score 39 · 22.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Our confidence | 82% |
| Coordinates | 30.1414, -80.8803 |
| Nearest City | Palm Valley (49 km) |
| Population Exposed | 20.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-12T09:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.846dc39ea41a433e34a61fe70dd4cdc9 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM |
| Headline | Special Marine Warning issued May 12 at 5:39AM EDT until May 12 at 6:45AM EDT by NWS Jacksonville FL |
| Expires | 2026-05-12T06:45:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.846dc39ea41a433e34a61fe70dd4cdc9ec9cb15f.001.1","noaa_urn:oid:2.49.0.1.840.0.bc9133e051a50d53055e8e6572d1d0d926c65c7e.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 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.