Right now
The most recent data we hold from NOAA arrived 25 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 6 September 2026 at 01:00 UTC. It is kept here as a record.
It is one of only 4 we have recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 5 at 8:39PM EDT until September 5 at 9:00PM EDT by NWS Wilmington OH
Urban PEI: 516,697 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- September 6, 2026 · score 41 · 0.0 km
- August 11, 2026 · 10.4 km
- August 12, 2026 · 11.9 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 41 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 41 / 100 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 38.8271, -84.5071 |
| Nearest City | Independence (13 km) |
| Urban exposure index (PEI) | 516.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-06T00:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.490029c0ea0a5367102d5b887a90b458a94e2186.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-06T00:39:00.000Z.
First archived: 2026-09-06T00:42:57.140Z. 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 | Boone, KY; Campbell, KY; Grant, KY; Kenton, KY; Pendleton, KY |
| Headline | Severe Thunderstorm Warning issued September 5 at 8:39PM EDT until September 5 at 9:00PM EDT by NWS Wilmington OH |
| Expires | 2026-09-05T21:00:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 49 |
| Iem Unit | MPH |
| Iem City | 3 NE Fairfield |
| Iem County | Butler |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | ASOS station KHAO Butler County Regional Airport. |
| MergedSources | [{"id":"iem_G_39.360_-84.520_1788649500000","source":"iem","severity":"low","severityValue":25,"timestamp":1788649500000,"latitude":39.36,"longitude":-84.52}] |
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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