This alert expired on 23 June 2026 at 21:30 UTC. It is kept here as a record.
No stronger detection stands among the 77 recorded within 20 km of this point since 16 March 2026 — 43 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 23 at 4:59PM EDT until June 23 at 5:30PM EDT by NWS Jacksonville FL
An estimated 1,175,098 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 13, 2026 · score 52 · 7.5 km
- July 25, 2026 · score 52 · 11.9 km
- August 9, 2026 · score 52 · 18.1 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 84% |
| Coordinates | 30.5341, -81.7857 |
| Nearest City | Jacksonville (26 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-23T20:59:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.51debc684acd9228d7a55c686ffa206b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Duval, FL; Nassau, FL; St. Johns, FL; Camden, GA; Nassau, FL; Camden, GA; Charlton, GA |
| Headline | Severe Thunderstorm Warning issued June 23 at 4:59PM EDT until June 23 at 5:30PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-23T17:30:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.51debc684acd9228d7a55c686ffa206beb03c2bb.001.1","noaa_urn:oid:2.49.0.1.840.0.a20ba5846fd736bd0b2c7b8358dc3f5e04fb2458.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 42 |
| Iem Unit | MPH |
| Iem City | 1 ESE Hilliard |
| Iem County | Nassau |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | WeatherStem Mesonet station GW4436 HILLIARD measured a wind gusts of 42 mph. |
| MergedSources | [{"id":"iem_G_30.690_-81.910_1782248400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782248400000,"latitude":30.69,"longitude":-81.91}] |
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 Jacksonville?
Calamity.live data shows a weather event with CalamityScore 52/100, near Jacksonville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.