This alert expired on 4 September 2026 at 04:00 UTC. It is kept here as a record.
It is the 82nd strongest of the 155 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 3 at 9:04PM EDT until September 4 at 12:00AM EDT by NWS State College PA
An estimated 29,201 people live within 50 km of this point.
Nearby, since 11 March 2026
- September 2, 2026 · score 46 · 0.0 km
- August 28, 2026 · score 28 · 0.0 km
- August 27, 2026 · score 34 · 0.0 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.
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) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 41.2000, -77.2000 |
| Nearest City | Williamsport (17 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T01:04:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3e93be94f494adcdfc906d3eddad96eb90f02fd4.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Adams, PA; Bedford, PA; Blair, PA; Cambria, PA; Cumberland, PA; Franklin, PA; Fulton, PA; Huntingdon, PA; Lancaster, PA; Somerset, PA; York, PA |
| Headline | Severe Thunderstorm Watch issued September 3 at 9:04PM EDT until September 4 at 12:00AM EDT by NWS State College PA |
| Expires | 2026-09-04T00:00:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | false |
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 Williamsport?
Calamity.live data shows a weather event with CalamityScore 28/100, near Williamsport (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.