Right now
The most recent data we hold from NOAA arrived 69 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 02:30 UTC. It is kept here as a record.
It is the 4th strongest of the 68 detections recorded within 20 km of this point since 15 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 9:42PM EDT until May 19 at 10:30PM EDT by NWS Charleston WV
An estimated 1,264,536 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 20, 2026 · score 52 · 0.0 km
- May 27, 2026 · score 76 · 8.6 km
- August 11, 2026 · score 52 · 11.6 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 52 / 100 |
| Our confidence | 86% |
| Coordinates | 39.8520, -82.5288 |
| Nearest City | Lancaster (17 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T01:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7bef9ba51fc6a0bc9315492990be560b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Perry, OH; Fairfield, OH; Franklin, OH; Licking, OH; Pickaway, OH |
| Headline | Severe Thunderstorm Warning issued May 19 at 9:42PM EDT until May 19 at 10:30PM EDT by NWS Charleston WV |
| Expires | 2026-05-19T22:30:00-04:00 |
| SenderName | NWS Charleston WV |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7bef9ba51fc6a0bc9315492990be560b88293ed8.001.1","noaa_urn:oid:2.49.0.1.840.0.a99822456b39d0ce7176d6e792382a6da51e6c73.001.1"] |
| Iem TypeSummary | D |
| Iem City | 3 SE Chesterhill |
| Iem County | Washington |
| Iem State | OH |
| Iem Wfo | RLX |
| Iem Remark | Tree limb down on house. Another tree down as well. |
| MergedSources | [{"id":"iem_D_39.460_-81.820_1779228240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779228240000,"latitude":39.46,"longitude":-81.82}] |
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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