This alert expired on 30 May 2026 at 21:30 UTC. It is kept here as a record.
It is the 53rd strongest of the 71 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 23 May 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 30 at 4:52PM EDT until May 30 at 5:30PM EDT by NWS Jacksonville FL
An estimated 210,324 people live within 50 km of this point.
Nearby, since 15 March 2026
- April 20, 2026 · score 43 · 10.4 km
- June 27, 2026 · score 39 · 10.9 km
- May 30, 2026 · score 39 · 11.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 80 % 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) | 37 / 100 |
| Our confidence | 80% |
| Coordinates | 29.7086, -81.6257 |
| Nearest City | St. Johns (42 km) |
| Population Exposed | 210.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-30T20:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.88040a0576c64bcbad09f5f35ca80839b05133b9.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clay, FL; Putnam, FL; St. Johns, FL |
| Headline | Severe Thunderstorm Warning issued May 30 at 4:52PM EDT until May 30 at 5:30PM EDT by NWS Jacksonville FL |
| Expires | 2026-05-30T17:30:00-04:00 |
| 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.
Want to know when something happens near St. Johns?
Calamity.live data shows a weather event with CalamityScore 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.