This alert expired on 3 September 2026 at 04:00 UTC. It is kept here as a record.
It is the 80th strongest of the 124 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 2 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 2 at 10:47PM EDT until September 3 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
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 91 % 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 | 91% |
| Coordinates | 41.2000, -77.2000 |
| Nearest City | Williamsport (17 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T02:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8c834e70b71c3049bb3e91c21fe5498e2c06a0b6.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Cameron, PA; Centre, PA; Clearfield, PA; Clinton, PA; Elk, PA; Lycoming, PA; McKean, PA; Potter, PA; Sullivan, PA; Tioga, PA; Warren, PA; Armstrong, PA; Butler, PA; Clarion, PA; Forest, PA; Indiana, PA; Jefferson, PA; Mercer, PA; Venango, PA |
| Headline | Severe Thunderstorm Watch issued September 2 at 10:47PM EDT until September 3 at 12:00AM EDT by NWS State College PA |
| Expires | 2026-09-03T00:00:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8c834e70b71c3049bb3e91c21fe5498e2c06a0b6.002.1","noaa_urn:oid:2.49.0.1.840.0.13eab81507d7d14d92e0e6ba8f051bee55e13856.002.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 E Carroll |
| Spc County | Clinton |
| Spc State | PA |
| Spc Comments | Tree down on East Valley Road... partially blocking the roadway. (CTP) |
| Iem TypeSummary | F |
| Iem City | Jersey Shore |
| Iem County | Lycoming |
| Iem State | PA |
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.