This alert expired on 20 May 2026 at 01:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 40 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 8:25PM EDT until May 19 at 9:30PM EDT by NWS Wilmington OH
An estimated 1,292,595 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 8, 2026 · score 52 · 13.0 km
- March 16, 2026 · score 52 · 14.0 km
- June 6, 2026 · score 52 · 18.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 85% |
| Coordinates | 39.9511, -83.5692 |
| Nearest City | Springfield (21 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Date | 2026-05-20 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6afee34c54afc7501978698aef8e37f7 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Delaware, OH; Franklin, OH; Licking, OH; Madison, OH; Union, OH; Champaign, OH; Delaware, OH; Franklin, OH; Madison, OH; Union, OH; Clark, OH; Clinton, OH; Fayette, OH; Greene, OH; Madison, OH and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 19 at 8:25PM EDT until May 19 at 9:30PM EDT by NWS Wilmington OH |
| Expires | 2026-05-19T21:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6afee34c54afc7501978698aef8e37f717b74ac5.001.1","noaa_urn:oid:2.49.0.1.840.0.fd0704daa29ab9421fed63fda64e9e9202391380.001.1","noaa_urn:oid:2.49.0.1.840.0.0fa1847efecea56ffcca0eeb3c97cb327b51b8c7.001.1","noaa_urn:oid:2.49.0.1.840.0.0a240e1e93612e1b32e9283514d9edea4fa8dd0e.002.1"] |
| Iem TypeSummary | D |
| Iem City | 2 NW Piqua |
| Iem County | Miami |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Trees down at Ziegler and Versailles Roads. Photos posted. Time estimated from RADAR. |
| MergedSources | [{"id":"iem_D_40.170_-84.270_1779231420000","source":"iem","severity":"low","severityValue":25,"timestamp":1779231420000,"latitude":40.17,"longitude":-84.27}] |
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 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 52/100, near Springfield (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.