This alert is in force until 2 September 2026, 01:00 UTC.
It is the 4th strongest of the 25 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 1 at 5:56PM EDT until September 1 at 9:00PM EDT by NWS State College PA
An estimated 29,201 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 2, 2026 · score 34 · 11.0 km
- June 12, 2026 · score 32 · 13.2 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 90 % 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 | 90% |
| Coordinates | 41.2533, -76.6617 |
| Nearest City | Williamsport (28 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-01T21:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7447874e31e9031da81d7cfe647ede04f194df91.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lycoming, PA |
| Headline | Flash Flood Warning issued September 1 at 5:56PM EDT until September 1 at 9:00PM EDT by NWS State College PA |
| Expires | 2026-09-01T21:00:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 4 SW Barbours |
| Spc County | Lycoming |
| Spc State | PA |
| Spc Comments | Multiple large branches down on the roadway... blocking traffic on Route 87. (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
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.