This alert expired on 11 August 2026 at 19:00 UTC. It is kept here as a record.
No stronger detection stands among the 28 recorded within 20 km of this point since 15 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued August 11 at 2:50PM EDT until August 11 at 3:00PM EDT by NWS Wilmington OH
An estimated 347,328 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 11, 2026 · score 67 · 3.9 km
- August 9, 2026 · score 52 · 11.0 km
- July 11, 2026 · score 43 · 12.8 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 67 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 67 / 100 |
| Our confidence | 91% |
| Coordinates | 39.7071, -83.5929 |
| Nearest City | Xenia (29 km) |
| Population Exposed | 347.3K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-08-11T18:50:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clark, OH; Fayette, OH; Greene, OH; Madison, OH |
| Headline | Tornado Warning issued August 11 at 2:50PM EDT until August 11 at 3:00PM EDT by NWS Wilmington OH |
| Expires | 2026-08-11T15:00:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 46 |
| Iem Unit | MPH |
| Iem City | 2 NW Vandalia |
| Iem County | Montgomery |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | ASOS station KDAY Dayton International Airport. |
| MergedSources | [{"id":"iem_G_39.910_-84.220_1786453920000","source":"iem","severity":"low","severityValue":25,"timestamp":1786453920000,"latitude":39.91,"longitude":-84.22},{"id":"iem_D_40.110_-83.750_1786454580000","source":"iem","severity":"low","severityValue":25,"timestamp":1786454580000,"latitude":40.11,"longitude":-83.75},{"id":"iem_D_40.310_-83.970_1786453620000","source":"iem","severity":"low","severityValue":25,"timestamp":1786453620000,"latitude":40.31,"longitude":-83.97},{"id":"iem_D_39.960_-83.490_1786455720000","source":"iem","severity":"low","severityValue":25,"timestamp":1786455720000,"latitude":39.96,"longitude":-83.49},{"id":"iem_D_40.050_-83.670_1786455060000","source":"iem","severity":"low","severityValue":25,"timestamp":1786455060000,"latitude":40.05,"longitude":-83.67},{"id":"iem_D_40.060_-83.780_1786454640000","source":"iem","severity":"low","severityValue":25,"timestamp":1786454640000,"latitude":40.06,"longitude":-83.78},{"id":"iem_G_39.570_-83.420_1786457700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786457700000,"latitude":39.57,"longitude":-83.42},{"id":"iem_G_39.430_-83.780_1786456860000","source":"iem","severity":"low","severityValue":25,"timestamp":1786456860000,"latitude":39.43,"longitude":-83.78},{"id":"iem_D_40.050_-83.680_1786455120000","source":"iem","severity":"low","severityValue":25,"timestamp":1786455120000,"latitude":40.05,"longitude":-83.68},{"id":"iem_G_39.910_-84.220_1786453560000","source":"iem","severity":"low","severityValue":25,"timestamp":1786453560000,"latitude":39.91,"longitude":-84.22}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 67/100, near Xenia (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 194 scientific monitoring sources.