This alert expired on 20 June 2026 at 22:00 UTC. It is kept here as a record.
No stronger detection stands among the 41 recorded within 20 km of this point since 16 March 2026 — 24 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 20 at 5:40PM EDT until June 20 at 6:00PM EDT by NWS Jacksonville FL
An estimated 145,214 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 29, 2026 · score 22 · 8.8 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 88 % 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) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 30.0480, -82.5500 |
| Nearest City | Gainesville (50 km) |
| Population Exposed | 145.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T21:40:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Baker, FL; Columbia, FL; Union, FL |
| Headline | Severe Thunderstorm Warning issued June 20 at 5:40PM EDT until June 20 at 6:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-20T18:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 40 |
| Iem Unit | MPH |
| Iem City | 1 NW Gainesville Airpor |
| Iem County | Alachua |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | ASOS station KGNV Gainesville. |
| MergedSources | [{"id":"iem_G_30.270_-82.800_1781988600000","source":"iem","severity":"low","severityValue":25,"timestamp":1781988600000,"latitude":30.27,"longitude":-82.8},{"id":"iem_G_29.700_-82.280_1781988660000","source":"iem","severity":"low","severityValue":25,"timestamp":1781988660000,"latitude":29.7,"longitude":-82.28}] |
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.
Calamity.live data shows a weather event with CalamityScore 43/100, near Gainesville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.