This alert expired on 12 August 2026 at 01:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 21 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 8:49PM EDT until August 11 at 9:30PM EDT by NWS Morristown TN
An estimated 44,572 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 5, 2026 · score 39 · 11.3 km
- September 5, 2026 · score 28 · 14.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 84 % 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) | 34 / 100 |
| Our confidence | 84% |
| Coordinates | 36.4190, -83.1539 |
| Nearest City | Morristown (26 km) |
| Population Exposed | 44.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T00:49:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.31a9d43585d211d7b14c61b8c8c56655 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Carter, TN; Johnson, TN; Carter, TN; Greene, TN; Hawkins, TN; Sullivan, TN; Unicoi, TN; Washington, TN; Claiborne, TN; Cocke, TN; Grainger, TN; Greene, TN; Hamblen, TN; Hancock, TN; Hawkins, TN; Jefferson, TN; Union, TN and 1 more areas |
| Headline | Severe Thunderstorm Warning issued August 11 at 8:49PM EDT until August 11 at 9:30PM EDT by NWS Morristown TN |
| Expires | 2026-08-11T21:30:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.31a9d43585d211d7b14c61b8c8c56655578f4eaf.001.1","noaa_urn:oid:2.49.0.1.840.0.e28cd0708cfee33130f5047879a449ef8e0c6914.002.1","noaa_urn:oid:2.49.0.1.840.0.b4c435653f4aaa5220654b65c5f9556ed1e3f5b6.001.1","noaa_urn:oid:2.49.0.1.840.0.e5f340f2a8803278f36af501f79f84f530c17d93.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 NE Rogersville |
| Iem County | Hawkins |
| Iem State | TN |
| Iem Wfo | MRX |
| Iem Remark | Several trees down. |
| MergedSources | [{"id":"iem_D_36.430_-82.990_1786494780000","source":"iem","severity":"low","severityValue":25,"timestamp":1786494780000,"latitude":36.43,"longitude":-82.99}] |
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 near Morristown?
Calamity.live data shows a weather event with CalamityScore 34/100, near Morristown (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.