Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 11 September 2026 at 23:15 UTC. It is kept here as a record.
It is the 86th strongest of the 161 detections recorded within 20 km of this point since 8 March 2026. The last comparable one was on 4 September 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 11 at 6:29PM EDT until September 11 at 7:15PM EDT by NWS Jacksonville FL
An estimated 1,254,030 people live within 50 km of this point.
Nearby, since 8 March 2026
- June 26, 2026 · score 52 · 1.1 km
- August 4, 2026 · score 52 · 2.6 km
- June 23, 2026 · score 52 · 4.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 81% |
| Coordinates | 30.3186, -81.4229 |
| Nearest City | Jacksonville Beach (4 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-11T22:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.e0f7de45ba44161765fff4d6c80234d0c7de4039.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Duval, FL; Nassau, FL; St. Johns, FL |
| Headline | Severe Thunderstorm Warning issued September 11 at 6:29PM EDT until September 11 at 7:15PM EDT by NWS Jacksonville FL |
| Expires | 2026-09-11T19:15:00-04:00 |
| 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 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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