This alert is in force until 2 September 2026, 04:00 UTC.
It is the 79th strongest of the 107 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 1 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 1 at 9:31PM 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
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 92 % 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 | 92% |
| Coordinates | 41.2000, -77.2000 |
| Nearest City | Williamsport (17 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T01:31:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.bd88118489f7e56bdd4b0a5bad6975b54709d550.002.1 |
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 9:31PM 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 |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 5 N Forksville |
| Spc County | Sullivan |
| Spc State | PA |
| Spc Comments | Trees down across Campbellsville Road. (CTP) |
| Iem TypeSummary | D |
| Iem City | 4 SW Barbours |
| Iem County | Lycoming |
| Iem State | PA |
| Iem Wfo | CTP |
| Iem Remark | Multiple large branches down on the roadway, blocking traffic on Route 87. |
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.