This alert expired on 2 September 2026 at 13:30 UTC. It is kept here as a record.
It is the 13th strongest of the 20 detections recorded within 20 km of this point since 1 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 9:13AM EDT until September 2 at 9:30AM EDT by NWS Pittsburgh PA
Nearby, since 1 April 2026
- July 7, 2026 · score 22 · 6.1 km
- July 28, 2026 · score 22 · 21.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 72 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 72% |
| Coordinates | 41.7080, -78.4636 |
| Nearest City | Jamestown (78 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T13:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.42fa4c31e499eab49f15751053a6f79240f9d3c2.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jefferson, PA; Butler, PA; Clarion, PA; Mercer, PA; Venango, PA; Cameron, PA; Elk, PA and 4 more areas |
| Headline | Severe Thunderstorm Warning issued September 2 at 9:13AM EDT until September 2 at 9:30AM EDT by NWS Pittsburgh PA |
| Expires | 2026-09-02T09:30:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.42fa4c31e499eab49f15751053a6f79240f9d3c2.001.1","noaa_urn:oid:2.49.0.1.840.0.00bfc784980b41ffbe975bce4e88b546f2fbc04c.001.1","noaa_urn:oid:2.49.0.1.840.0.a3762d98573583a0a962831513b916ad9659cf05.001.1","noaa_urn:oid:2.49.0.1.840.0.94864dff21fa5228a0cc9436e877c3bbec876919.001.1","noaa_urn:oid:2.49.0.1.840.0.f9f6a2b381950b225f19527af9c0d85fa14c493f.001.1","noaa_urn:oid:2.49.0.1.840.0.db89a16801b7f9ad631b629d2053a563f9cc6458.001.1","noaa_urn:oid:2.49.0.1.840.0.70b59402e9ff0eeb19d1d43bee6d50e4ab2a3964.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 3 WNW Warren |
| Spc County | Warren |
| Spc State | PA |
| Spc Comments | Multiple trees down around the 1900 block of Follett Run Road. (CTP) |
| Iem TypeSummary | D |
| Iem City | 1 ESE Little Valley |
| Iem County | Cattaraugus |
| Iem State | NY |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.