This alert expired on 11 August 2026 at 12:30 UTC. It is kept here as a record.
It is the 5th strongest of the 34 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 10 August 2026. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 7:30AM EDT until August 11 at 8:30AM EDT by NWS Cleveland OH
An estimated 454,857 people live within 50 km of this point.
Nearby, since 17 March 2026
- May 27, 2026 · score 43 · 12.1 km
- September 4, 2026 · score 41 · 21.6 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 81 % 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 | 81% |
| Coordinates | 40.6860, -81.6670 |
| Nearest City | Massillon (18 km) |
| Population Exposed | 454.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T11:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.99b5c4bd0d0d45a9084a6e7b17750cc3a8919717.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Holmes, OH; Stark, OH; Wayne, OH |
| Headline | Severe Thunderstorm Warning issued August 11 at 7:30AM EDT until August 11 at 8:30AM EDT by NWS Cleveland OH |
| Expires | 2026-08-11T08:30:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
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.
Want to know when something happens near Massillon?
Calamity.live data shows a weather event with CalamityScore 43/100, near Massillon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.