Right now
The most recent data we hold from NOAA arrived 10 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, 21 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 167 recorded within 20 km of this point since 8 March 2026 — 70 others scored the same. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 31 at 5:45PM 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 · 0.0 km
- July 31, 2026 · score 52 · 1.0 km
- September 6, 2026 · score 46 · 10.7 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 84 % 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 | 84% |
| Coordinates | 30.4043, -81.6643 |
| Nearest City | Jacksonville (8 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T21:45:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6f14aed0229afc392befeb094f28e14d56a35289.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Duval, FL |
| Headline | Severe Thunderstorm Warning issued May 31 at 5:45PM 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 |
| Iem TypeSummary | G |
| Iem Magnitude | 47 |
| Iem Unit | MPH |
| Iem City | 2 NE Jacksonville Inter |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | ASOS station KJAX Jacksonville Intl Airport. |
| MergedSources | [{"id":"iem_G_30.500_-81.680_1780263180000","source":"iem","severity":"low","severityValue":25,"timestamp":1780263180000,"latitude":30.5,"longitude":-81.68}] |
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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