Right now
The most recent data we hold from NOAA arrived 4 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 10 May 2026 at 00:15 UTC. It is kept here as a record.
It is the 11th strongest of the 146 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 9 at 7:57PM EDT until May 9 at 8:15PM EDT by NWS Cleveland OH
An estimated 226,980 people live within 50 km of this point.
Nearby, since 17 March 2026
- May 10, 2026 · score 43 · 0.0 km
- July 5, 2026 · score 43 · 6.4 km
- September 4, 2026 · score 37 · 6.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 79 % 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) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 41.1813, -80.4887 |
| Nearest City | Hermitage (6 km) |
| Population Exposed | 227.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-09T23:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a3be87b42837933b0d2a038f7d154fa6 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Trumbull, OH; Lawrence, PA; Mercer, PA |
| Headline | Severe Thunderstorm Warning issued May 9 at 7:57PM EDT until May 9 at 8:15PM EDT by NWS Cleveland OH |
| Expires | 2026-05-09T20:15:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a3be87b42837933b0d2a038f7d154fa6da44ac64.001.1","noaa_urn:oid:2.49.0.1.840.0.526c33276f477f78356e2304340581cf28fe695f.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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