Right now
The most recent data we hold from NOAA arrived 5 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 04:45 UTC. It is kept here as a record.
It is the 9th strongest of the 29 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 8:45PM CDT until July 21 at 11:45PM CDT by NWS Nashville TN
Urban PEI: 913,217 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- March 12, 2026 · score 48 · 8.3 km
- July 22, 2026 · score 48 · 14.0 km
- March 16, 2026 · score 72 · 14.8 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.
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) | 48 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 36.4842, -86.4314 |
| Nearest City | Gallatin (11 km) |
| Urban exposure index (PEI) | 913.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-22T01:45:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.88558d63c79f3129ba5aca1c258c9550 |
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: 2026-07-22T01:45:00.000Z.
First archived: 2026-07-22T02:06:03.641Z. 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 | Davidson, TN; Robertson, TN; Sumner, TN; Wilson, TN; Cannon, TN; Rutherford, TN; Williamson, TN; Davidson, TN; Smith, TN; Wilson, TN and 9 more areas |
| Headline | Flash Flood Warning issued July 21 at 8:45PM CDT until July 21 at 11:45PM CDT by NWS Nashville TN |
| Expires | 2026-07-21T23:45:00-05:00 |
| SenderName | NWS Nashville TN |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.88558d63c79f3129ba5aca1c258c95500ff15ee1.001.1","noaa_urn:oid:2.49.0.1.840.0.1b36f9690c3d5654b796c6b0788e954bf29cc4fd.001.1","noaa_urn:oid:2.49.0.1.840.0.e891e299e1d83d2cb4032481cf3911cf5b8ae21a.001.1","noaa_urn:oid:2.49.0.1.840.0.ed745bfe53f081fd2d1755a07e740cd18258400b.001.1","noaa_urn:oid:2.49.0.1.840.0.59d6567e485467490dffa5eb548fa31789a9746f.001.1","noaa_urn:oid:2.49.0.1.840.0.dd306b4a5a6d5f3a1ec237c2b5e42774ee0b271e.001.1","noaa_urn:oid:2.49.0.1.840.0.f1e3f17a173b94db461d1f0791625bb0b4de719b.001.1","noaa_urn:oid:2.49.0.1.840.0.88fd4191418a805aae0231a9caa4a36c7996a4f3.001.1","noaa_urn:oid:2.49.0.1.840.0.1caa0495e25847c39fe09b6730a96dd96413688c.001.1","noaa_urn:oid:2.49.0.1.840.0.58d5cc929fb9319b2b00cc488f66db3080c5ba68.001.1","noaa_urn:oid:2.49.0.1.840.0.d64b9ffc1aadeb03c2d1e5e10d63715de1d568ba.001.1","noaa_urn:oid:2.49.0.1.840.0.16737b2461190312f85fbbe701d385eb0a0e5028.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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