This alert expired on 9 August 2026 at 01:45 UTC. It is kept here as a record.
It is the 5th strongest of the 75 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 8 August 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 8 at 9:11PM EDT until August 8 at 9:45PM EDT by NWS Pittsburgh PA
An estimated 525,168 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 10, 2026 · score 48 · 8.0 km
- July 5, 2026 · score 48 · 8.1 km
- July 21, 2026 · score 67 · 10.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 86 % 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) | 48 / 100 |
| Our confidence | 86% |
| Coordinates | 40.7962, -80.0487 |
| Nearest City | Cranberry Township (14 km) |
| Population Exposed | 525.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-09T01:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.791689d51b6fe797c5451b1fd856cf66 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clarion, PA; Jefferson, PA; Armstrong, PA; Butler, PA; Coshocton, OH; Tuscarawas, OH |
| Headline | Severe Thunderstorm Warning issued August 8 at 9:11PM EDT until August 8 at 9:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-08-08T21:45:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.791689d51b6fe797c5451b1fd856cf66a4da90ea.001.1","noaa_urn:oid:2.49.0.1.840.0.71515801d591ef8d500788cab253d73ea298ae9d.001.1","noaa_urn:oid:2.49.0.1.840.0.ee2ba3e118ab74d5af5f3c5d646d80da4115b3e2.001.1"] |
| Iem TypeSummary | D |
| Iem City | 5 ESE Harrisville |
| Iem County | Butler |
| Iem State | PA |
| Iem Wfo | PBZ |
| Iem Remark | Report and video of a snapped tree along Boyers Road. Time estimated based on radar. |
| MergedSources | [{"id":"iem_D_41.110_-79.930_1786233420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786233420000,"latitude":41.11,"longitude":-79.93}] |
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.
Want to know when something happens near Cranberry Township?
Calamity.live data shows a weather event with CalamityScore 48/100, near Cranberry Township (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.