This alert expired on 1 September 2026 at 21:30 UTC. It is kept here as a record.
It is the 4th strongest of the 14 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 4 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 1 at 5:02PM EDT until September 1 at 5:30PM EDT by NWS Buffalo NY
An estimated 29,201 people live within 50 km of this point.
Nearby, since 17 March 2026
- September 1, 2026 · score 28 · 8.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100, at 81 % 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) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 41.6562, -77.1607 |
| Nearest City | Williamsport (48 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-01T21:02:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.e4605016a305060715709c405900e83d32250f01.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Allegany, NY; Lycoming, PA; Tioga, PA; Lycoming, PA; Sullivan, PA |
| Headline | Severe Thunderstorm Warning issued September 1 at 5:02PM EDT until September 1 at 5:30PM EDT by NWS Buffalo NY |
| Expires | 2026-09-01T17:30:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e4605016a305060715709c405900e83d32250f01.001.1","noaa_urn:oid:2.49.0.1.840.0.552ce41e54c96ee04273329e4543ea4e0d9a0ca6.001.1","noaa_urn:oid:2.49.0.1.840.0.5d88c046bb547a8ba8cf3977fb38817d6c7d95b4.001.1"] |
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 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 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.