Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 7 km from here.
This alert expired on 21 September 2026 at 00:30 UTC. It is kept here as a record.
No stronger detection stands among the 146 recorded within 20 km of this point since 15 March 2026 — 5 others scored the same. The last comparable one was on 5 September 2026.
What the source measured
NOAA reported: Tornado Warning issued September 20 at 7:54PM EDT until September 20 at 8:30PM EDT by NWS Wilmington OH
Urban PEI: 1,095,253 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- September 5, 2026 · score 41 · 8.9 km
- September 4, 2026 · score 41 · 8.9 km
- May 28, 2026 · score 52 · 11.7 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 76 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Critical |
| Calamity Score (ours) | 76 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.5688, -84.4525 |
| Nearest City | Middletown (7 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-09-20T23:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.250b20ac06e861e1cd86de7822658f17d815462b.001.1 |
Physical priority index · v5. 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: 2026-09-20T23:54:00.000Z.
First archived: 2026-09-20T23:59:05.634Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Butler, OH; Montgomery, OH; Warren, OH |
| Headline | Tornado Warning issued September 20 at 7:54PM EDT until September 20 at 8:30PM EDT by NWS Wilmington OH |
| Expires | 2026-09-20T20:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 200 |
| Spc Location | Liberty |
| Spc County | Union |
| Spc State | IN |
| Spc Comments | Photo verified. Time estimated from radar. (ILN) |
| Iem TypeSummary | H |
| Iem Magnitude | 2 |
| Iem Unit | Inch |
| Iem City | Liberty |
| Iem County | Union |
| Iem State | IN |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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