This alert is in force until 2 September 2026, 04:00 UTC.
It is the 79th strongest of the 104 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 28 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 1 at 4:32PM EDT until September 2 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
- August 28, 2026 · score 28 · 0.0 km
- August 27, 2026 · score 34 · 0.0 km
- August 10, 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 80 % 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 | 80% |
| Coordinates | 41.2000, -77.2000 |
| Nearest City | Williamsport (17 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-01T20:32:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.bfaf7b804662df7e11c539b217f93f1006595e9e.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Centre, PA; Clinton, PA; Columbia, PA; Cumberland, PA; Dauphin, PA; Juniata, PA; Lancaster, PA; Lebanon, PA; Lycoming, PA; Mifflin, PA; Montour, PA; Northumberland, PA; Perry, PA; Potter, PA; Schuylkill, PA; Snyder, PA; Sullivan, PA; Tioga, PA; Union, PA; York, PA |
| Headline | Severe Thunderstorm Watch issued September 1 at 4:32PM EDT until September 2 at 12:00AM EDT by NWS State College PA |
| Expires | 2026-09-02T00:00:00-04:00 |
| 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 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 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.