Right now
The most recent data we hold from NOAA arrived 89 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 20 May 2026 at 00:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 33 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 19 May 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 8:01PM EDT until May 19 at 8:30PM EDT by NWS Wilmington OH
Urban PEI: 572,778 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- May 19, 2026 · score 48 · 1.7 km
- August 12, 2026 · score 43 · 16.9 km
- March 12, 2026 · score 43 · 18.0 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 48 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.9518, -83.7957 |
| Nearest City | Springfield (4 km) |
| Urban exposure index (PEI) | 572.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T00:01:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.dbebaf6e50f971aa8139dcf2dd84a17b |
Physical priority index · v1. 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: 2026-05-20T00:01:00.000Z.
First archived: 2026-05-20T00:11:09.438Z. 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 | Champaign, OH; Delaware, OH; Franklin, OH; Madison, OH; Union, OH; Butler, OH; Greene, OH; Montgomery, OH; Warren, OH |
| Headline | Severe Thunderstorm Warning issued May 19 at 8:01PM EDT until May 19 at 8:30PM EDT by NWS Wilmington OH |
| Expires | 2026-05-19T20:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.dbebaf6e50f971aa8139dcf2dd84a17b7cf73910.002.1","noaa_urn:oid:2.49.0.1.840.0.0a240e1e93612e1b32e9283514d9edea4fa8dd0e.002.1"] |
| Iem TypeSummary | D |
| Iem City | 4 ENE Wayne Lakes |
| Iem County | Darke |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Metal roof damage. Photos posted. Time estimated by RADAR. |
| MergedSources | [{"id":"iem_D_40.170_-84.270_1779231420000","source":"iem","severity":"low","severityValue":25,"timestamp":1779231420000,"latitude":40.17,"longitude":-84.27},{"id":"iem_D_40.050_-84.600_1779229920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779229920000,"latitude":40.05,"longitude":-84.6}] |
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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