Right now
The most recent data we hold from NOAA arrived 31 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 16 km from here.
This alert expired on 31 May 2026 at 22:00 UTC. It is kept here as a record.
No stronger detection stands among the 201 recorded within 20 km of this point since 8 March 2026 — 83 others scored the same. The last comparable one was on 30 May 2026. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 31 at 5:24PM EDT until May 31 at 6:00PM EDT by NWS Jacksonville FL
An estimated 1,270,517 people live within 50 km of this point.
Nearby, since 8 March 2026
- May 31, 2026 · score 52 · 7.0 km
- July 31, 2026 · score 52 · 7.4 km
- July 29, 2026 · score 52 · 9.0 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.
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) | 52 / 100 |
| Our confidence | 78% |
| Coordinates | 30.4067, -81.5917 |
| Nearest City | Jacksonville (11 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T21:24:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f48c7d1cbb61676ea34d3375f36665e7595ef80d.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Duval, FL; Nassau, FL |
| Headline | Severe Thunderstorm Warning issued May 31 at 5:24PM EDT until May 31 at 6:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-05-31T18:00:00-04:00 |
| 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.
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