Right now
The most recent data we hold from NOAA arrived 2 hours 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 21 July 2026 at 23:45 UTC. It is kept here as a record.
It is the 7th strongest of the 18 detections recorded within 20 km of this point since 28 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 5:53PM CDT until July 21 at 6:45PM CDT by NWS Louisville KY
Urban PEI: 16,690 within a heuristic 50 km radius; not unique people.
Nearby, since 28 April 2026
- August 6, 2026 · score 34 · 25.0 km
- August 5, 2026 · score 34 · 25.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 37.4004, -84.8839 |
| Nearest City | Danville (30 km) |
| Urban exposure index (PEI) | 16.7K within 50 km |
| Impact Tier | significant |
| Date | 2026-07-21 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.02119db7658d635c70d527ab2cb7dd96 |
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: 2026-07-21 — time not reported.
First archived: 2026-07-21T22:54:25.974Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Allen, KY; Simpson, KY; Warren, KY; Caldwell, KY; Christian, KY; Hopkins, KY; Allen, KY; Barren, KY; Warren, KY and 3 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 5:53PM CDT until July 21 at 6:45PM CDT by NWS Louisville KY |
| Expires | 2026-07-21T18:45:00-05:00 |
| SenderName | NWS Louisville KY |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.02119db7658d635c70d527ab2cb7dd96b2c6c49d.001.1","noaa_urn:oid:2.49.0.1.840.0.32e168cd111d91488626e93efdaa0960f4bf3364.001.1","noaa_urn:oid:2.49.0.1.840.0.b5d4874c3febb8b092582da174a2860ccebc04de.001.1","noaa_urn:oid:2.49.0.1.840.0.0d1a0a894d7227cd81ebf5e7232341f7a4f81590.001.1","noaa_urn:oid:2.49.0.1.840.0.157e91cc7095d06e59338f70d6e73155a8eacb9f.001.1","noaa_urn:oid:2.49.0.1.840.0.04db6227a5a04656633f34f9b52604c2877379b7.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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