Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 22 July 2026 at 09:00 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. 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: Flash Flood Warning issued July 22 at 2:11AM CDT until July 22 at 4:00AM CDT by NWS Nashville TN
Urban PEI: 233,895 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 22, 2026 · score 43 · 9.3 km
- July 2, 2026 · score 43 · 9.7 km
- August 8, 2026 · score 39 · 15.7 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.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 35.7297, -87.1627 |
| Nearest City | Columbia (16 km) |
| Urban exposure index (PEI) | 233.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-22T07:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.3b1d21a263e9c663c91ad96992eadefa |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-22T07:11:00.000Z.
First archived: 2026-07-22T07:38:59.313Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lewis, TN; Perry, TN; Davidson, TN; Smith, TN; Wilson, TN; Lewis, TN; Maury, TN; Perry, TN and 4 more areas |
| Headline | Flash Flood Warning issued July 22 at 2:11AM CDT until July 22 at 4:00AM CDT by NWS Nashville TN |
| Expires | 2026-07-22T04:00:00-05:00 |
| SenderName | NWS Nashville TN |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3b1d21a263e9c663c91ad96992eadefacc3e55ea.001.1","noaa_urn:oid:2.49.0.1.840.0.a97967a53dc047c988d0a575aad03f5c4bae77ce.001.1","noaa_urn:oid:2.49.0.1.840.0.2a2c3b9b46227da6c1faca443e93af80c435b5a1.001.1","noaa_urn:oid:2.49.0.1.840.0.1762c37ce4fc9707a654a64b356ce824470e5da6.001.1","noaa_urn:oid:2.49.0.1.840.0.d71c354605f4eec621d9f9f0448843bf0ff2fced.001.1","noaa_urn:oid:2.49.0.1.840.0.ea78354a475e72bc7bcc052bceb5d5db360f1e86.001.1","noaa_urn:oid:2.49.0.1.840.0.87c9cf65e015c4561aab7d6b362b2c9ab5e91b8e.001.1"] |
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.
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