This alert expired on 4 August 2026 at 19:45 UTC. It is kept here as a record.
It is the 16th strongest of the 39 detections recorded within 20 km of this point since 8 March 2026. The last comparable one was on 29 July 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 4 at 2:41PM EDT until August 4 at 3:45PM EDT by NWS Jacksonville FL
An estimated 73,676 people live within 50 km of this point.
Nearby, since 8 March 2026
- July 11, 2026 · score 52 · 10.0 km
- June 20, 2026 · score 52 · 10.7 km
- June 27, 2026 · score 52 · 11.7 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 81 % 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 | 81% |
| Coordinates | 30.7358, -81.3233 |
| Nearest City | St. Marys (22 km) |
| Population Exposed | 73.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-04T18:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.863b597ea41e99257c97fea0d2be0155b8d329fc.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM |
| Headline | Special Marine Warning issued August 4 at 2:41PM EDT until August 4 at 3:45PM EDT by NWS Jacksonville FL |
| Expires | 2026-08-04T15:45:00-04:00 |
| 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 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 near St. Marys?
Calamity.live data shows a weather event with CalamityScore 39/100, near St. Marys (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.