This alert expired on 28 May 2026 at 21:15 UTC. It is kept here as a record.
No stronger detection stands among the 44 recorded within 20 km of this point since 8 March 2026 — 24 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 28 at 5:06PM EDT until May 28 at 5:15PM EDT by NWS Jacksonville FL
An estimated 1,067,352 people live within 50 km of this point.
Nearby, since 8 March 2026
- June 19, 2026 · score 52 · 3.4 km
- May 9, 2026 · score 52 · 5.1 km
- August 9, 2026 · score 52 · 9.6 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 | 30.6960, -81.5720 |
| Nearest City | St. Marys (4 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T21:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b4d3870852267b16d0c743c545c7d57f99cfba4e.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Nassau, FL; Camden, GA |
| Headline | Severe Thunderstorm Warning issued May 28 at 5:06PM EDT until May 28 at 5:15PM EDT by NWS Jacksonville FL |
| Expires | 2026-05-28T17:15:00-04:00 |
| 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 St. Marys (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.