This alert expired on 12 March 2026 at 16:45 UTC. It is kept here as a record.
No stronger detection stands among the 143 recorded within 20 km of this point since 8 March 2026 — 78 others scored the same. The last comparable one was on 8 March 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued March 12 at 11:47AM EDT until March 12 at 12:45PM EDT by NWS Jacksonville FL
An estimated 1,233,715 people live within 50 km of this point.
Nearby, since 8 March 2026
- June 21, 2026 · score 52 · 2.3 km
- July 30, 2026 · score 52 · 3.4 km
- August 4, 2026 · score 52 · 5.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 78 % 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) | 52 / 100 |
| Our confidence | 78% |
| Coordinates | 30.3790, -81.3750 |
| Nearest City | Jacksonville Beach (10 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-12T15:47:00.000Z |
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 March 12 at 11:47AM EDT until March 12 at 12:45PM EDT by NWS Jacksonville FL |
| Expires | 2026-03-12T12:45:00-04:00 |
| SenderName | NWS Jacksonville FL |
| 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 52/100, near Jacksonville Beach (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 194 scientific monitoring sources.