Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
11 other detections within 20 km in the last 24 hours, the nearest 2 km from here.
This alert expired on 10 September 2026 at 02:00 UTC. It is kept here as a record.
It is the 34th strongest of the 75 detections recorded within 20 km of this point since 17 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: Severe Thunderstorm Warning issued September 9 at 9:43PM EDT until September 9 at 10:00PM EDT by NWS Wilmington OH
An estimated 238,682 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 7, 2026 · score 43 · 6.0 km
- May 27, 2026 · score 76 · 7.1 km
- May 20, 2026 · score 43 · 10.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 37 / 100 |
| Our confidence | 81% |
| Coordinates | 39.7636, -82.3998 |
| Nearest City | Lancaster (18 km) |
| Population Exposed | 238.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-10T01:43:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.72bd8cb5bd1d84d7ff75ef17d969b01ae1c90a69.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Fairfield, OH; Perry, OH |
| Headline | Severe Thunderstorm Warning issued September 9 at 9:43PM EDT until September 9 at 10:00PM EDT by NWS Wilmington OH |
| Expires | 2026-09-09T22:00:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.72bd8cb5bd1d84d7ff75ef17d969b01ae1c90a69.001.1","noaa_urn:oid:2.49.0.1.840.0.41d4e538b09571d89121ae1caa5cedd7d39aee72.001.1"] |
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.
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