This alert expired on 1 September 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 11 recorded within 20 km of this point since 15 April 2026 — one other scored the same. The last comparable one was on 11 July 2026.
What the source measured
NOAA reported: Tornado Warning issued September 1 at 5:13PM EDT until September 1 at 5:45PM EDT by NWS State College PA
Nearby, since 15 April 2026
- July 7, 2026 · score 22 · 5.0 km
- June 14, 2026 · score 46 · 8.7 km
- July 11, 2026 · score 22 · 20.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 60% |
| Coordinates | 41.8620, -77.7080 |
| Nearest City | Elmira (78 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-01T21:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.661ad1cbcb04bf940835e91967dc4214526753c1.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Potter, PA; Tioga, PA |
| Headline | Tornado Warning issued September 1 at 5:13PM EDT until September 1 at 5:45PM EDT by NWS State College PA |
| Expires | 2026-09-01T17:45:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | true |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 in this area?
Calamity.live data shows a weather event with CalamityScore 46/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.