This alert expired on 18 July 2026 at 00:45 UTC. It is kept here as a record.
It is the 5th strongest of the 25 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 11 July 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 17 at 4:40PM CDT until July 17 at 7:45PM CDT by NWS Nashville TN
An estimated 961,348 people live within 50 km of this point.
Nearby, since 16 March 2026
- March 16, 2026 · score 54 · 4.6 km
- June 9, 2026 · score 48 · 5.2 km
- June 9, 2026 · score 52 · 19.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 79% |
| Coordinates | 36.4656, -87.1356 |
| Nearest City | Clarksville (21 km) |
| Population Exposed | 961.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-17T21:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.27533fafa6b2a5ca6d25e010e638ac0df3ec0ed1.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Cheatham, TN; Dickson, TN; Montgomery, TN; Robertson, TN |
| Headline | Flash Flood Warning issued July 17 at 4:40PM CDT until July 17 at 7:45PM CDT by NWS Nashville TN |
| Expires | 2026-07-17T19:45:00-05:00 |
| SenderName | NWS Nashville TN |
| HasExactCoords | true |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 Clarksville?
Calamity.live data shows a weather event with CalamityScore 48/100, near Clarksville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.