This alert expired on 12 August 2026 at 06:45 UTC. It is kept here as a record.
It is the 25th strongest of the 38 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 9 August 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 11 at 10:52PM CDT until August 12 at 1:45AM CDT by NWS Nashville TN
An estimated 29,302 people live within 50 km of this point.
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 | 36.1206, -84.6882 |
| Nearest City | Oak Ridge (40 km) |
| Population Exposed | 29.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T03:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.9ffd3c43e660f8c75e83c57191c0761e |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Davidson, TN; Rutherford, TN; Williamson, TN; Wilson, TN; Adair, KY; Casey, KY; Russell, KY; Blount, TN; Knox, TN and 2 more areas |
| Headline | Flash Flood Warning issued August 11 at 10:52PM CDT until August 12 at 1:45AM CDT by NWS Nashville TN |
| Expires | 2026-08-12T01:45:00-05:00 |
| SenderName | NWS Nashville TN |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9ffd3c43e660f8c75e83c57191c0761eb42337a8.001.1","noaa_urn:oid:2.49.0.1.840.0.98f405c9babb3fcb8fb59f6f1ef9b12a04b1ccd4.001.1","noaa_urn:oid:2.49.0.1.840.0.dc9cf5405239673dee486d6bb7106674ef0845b1.001.1","noaa_urn:oid:2.49.0.1.840.0.2fb7162aeb06458d4497c82fe0acd37bda365598.001.1","noaa_urn:oid:2.49.0.1.840.0.4ebc2acc4d1e815467b13011569abba4fd39d48b.001.1"] |
| Iem TypeSummary | F |
| Iem City | 3 NE Farragut |
| Iem County | Knox |
| Iem State | TN |
| Iem Wfo | MRX |
| Iem Remark | Amateur radio reports of roads flooding and stalled vehicles near the Target in Turkey Creek retail center. |
| MergedSources | [{"id":"iem_F_35.900_-84.150_1786499760000","source":"iem","severity":"low","severityValue":25,"timestamp":1786499760000,"latitude":35.9,"longitude":-84.15}] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.