Right now
The most recent data we hold from NOAA arrived 20 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 00:30 UTC. It is kept here as a record.
It is the 7th strongest of the 90 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 5:34PM EDT until July 21 at 8:30PM EDT by NWS Louisville KY
Urban PEI: 42,136 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- May 19, 2026 · score 34 · 3.4 km
- September 11, 2026 · score 28 · 15.5 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 | 39.0237, -82.7208 |
| Nearest City | Portsmouth (41 km) |
| Urban exposure index (PEI) | 42.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T21:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.eee25d424baebf594080174199a9d605 |
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: 2026-07-21T21:34:00.000Z.
First archived: 2026-07-21T21:37:21.032Z. 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 | Bullitt, KY; Hardin, KY; Larue, KY; Marion, KY; Nelson, KY; Breckinridge, KY; Grayson, KY; Hardin, KY; Anderson, KY and 16 more areas |
| Headline | Flash Flood Warning issued July 21 at 5:34PM EDT until July 21 at 8:30PM EDT by NWS Louisville KY |
| Expires | 2026-07-21T20:30:00-04:00 |
| SenderName | NWS Louisville KY |
| HasExactCoords | true |
| MergedCount | 19 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eee25d424baebf594080174199a9d605b2771796.001.1","noaa_urn:oid:2.49.0.1.840.0.45b0fb0ac584ad3cc06b4846fc48ec0dc5f338f5.001.1","noaa_urn:oid:2.49.0.1.840.0.7938767b5910e29b37a90380eba062e5502b9879.001.1","noaa_urn:oid:2.49.0.1.840.0.5e6e8d96cd7e5c5a5a64309a15f0df4dd4d6cab6.001.1","noaa_urn:oid:2.49.0.1.840.0.dbafd5e2738a4a8f1f587f5ce0430780e8f263ba.001.1","noaa_urn:oid:2.49.0.1.840.0.fee76dab32cf26866c8184e41fe85418b7b5b317.001.1","noaa_urn:oid:2.49.0.1.840.0.6a941eefd04004b2f8a7b7e40c17681b352944a0.001.1","noaa_urn:oid:2.49.0.1.840.0.a1ae0d29221641d7690051f9e8d07f7db62862e3.001.1","noaa_urn:oid:2.49.0.1.840.0.9386ea37467059988ae31d3a159e811eaf972fbb.001.1","noaa_urn:oid:2.49.0.1.840.0.87977820dd0e9f8ce86a978f729844afb03de261.002.1","noaa_urn:oid:2.49.0.1.840.0.8c1e59812a53989e3f27d1525e37934f436aa48d.001.1","noaa_urn:oid:2.49.0.1.840.0.e97289469902cf9dde5601905760448071817476.001.1","noaa_urn:oid:2.49.0.1.840.0.99aeb9a8dac3fc3014380e4cc4f0383891c0d9c1.001.1","noaa_urn:oid:2.49.0.1.840.0.9288b4cc0d26de424adb7c82b77ce5375d42c137.001.1","noaa_urn:oid:2.49.0.1.840.0.f5ae597e18c10174237a4c93fbb456ab2cc5bda9.001.1","noaa_urn:oid:2.49.0.1.840.0.d938468713693cf4888ee93c414b46ba46c1f4f7.001.1","noaa_urn:oid:2.49.0.1.840.0.2dc8ac58896f23e88e92f3acb9a1c77bc398f055.001.1","noaa_urn:oid:2.49.0.1.840.0.66e195f5d270d2a9e526a0a22144f1669467b6e4.001.1","noaa_urn:oid:2.49.0.1.840.0.ab10467be9dfbec978f97f7588f7fe87521cdaa2.001.1"] |
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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