This alert expired on 22 May 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 18 recorded within 20 km of this point since 16 March 2026 — 7 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 May 22 at 6:19PM EDT until May 22 at 6:45PM EDT by NWS Morristown TN
An estimated 220,218 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 22, 2026 · score 43 · 5.7 km
- May 22, 2026 · score 43 · 9.4 km
- July 5, 2026 · score 43 · 18.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 79 % 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) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 36.2886, -83.7964 |
| Nearest City | Knoxville (38 km) |
| Population Exposed | 220.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-22T22:19:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ce0d2f65758bbadc3c1a8db3b089a0d584c782d9.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grainger, TN; Knox, TN; Union, TN |
| Headline | Severe Thunderstorm Warning issued May 22 at 6:19PM EDT until May 22 at 6:45PM EDT by NWS Morristown TN |
| Expires | 2026-05-22T18:45:00-04:00 |
| SenderName | NWS Morristown TN |
| 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.