This alert expired on 1 September 2026 at 23:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 9 detections recorded within 20 km of this point since 12 June 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 1 at 6:22PM EDT until September 1 at 7:15PM EDT by NWS Upton NY
An estimated 29,201 people live within 50 km of this point.
Nearby, since 12 June 2026
- June 12, 2026 · score 32 · 26.4 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 | 41.0869, -76.7271 |
| Nearest City | Williamsport (28 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-01T22:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.5a541f31db4e16b11d12ea5f1c7679f4e4c59635.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hudson, NJ; Union, NJ; Kings, NY; Richmond, NY; Warren, NJ; Monroe, PA; Northampton, PA; Berks, PA and 8 more areas |
| Headline | Severe Thunderstorm Warning issued September 1 at 6:22PM EDT until September 1 at 7:15PM EDT by NWS Upton NY |
| Expires | 2026-09-01T19:15:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5a541f31db4e16b11d12ea5f1c7679f4e4c59635.001.1","noaa_urn:oid:2.49.0.1.840.0.343e3a502298a2d944dca1c6bb3a4d2d8a1a7668.001.1","noaa_urn:oid:2.49.0.1.840.0.5d0f892995c57d376763e04fe82b2af240d1f2ce.001.1","noaa_urn:oid:2.49.0.1.840.0.875a55868904f91bb2b3dcad606c14006ba4aa12.001.1","noaa_urn:oid:2.49.0.1.840.0.28d6d9eea6d3ee3a8e5f4268fe3dee4f0ad9b108.001.1","noaa_urn:oid:2.49.0.1.840.0.1f3eb2a587ad82fcf7af2eecdc711fa55f2ddf95.001.1","noaa_urn:oid:2.49.0.1.840.0.1efaaf9233d2b3c353b0356231dd561c9d6f33c5.001.1","noaa_urn:oid:2.49.0.1.840.0.a2b02feda44dbca54937c0b143ffe0a0e40f8830.002.1","noaa_urn:oid:2.49.0.1.840.0.9076b7d9c689bea7a3316a87b8ebcbefcfe3ca3e.001.1","noaa_urn:oid:2.49.0.1.840.0.dd21d5f14878d45b39a9ea932e085a04435f1994.001.1","noaa_urn:oid:2.49.0.1.840.0.48caace2068af0fcef27aa791afd4c8134ec3cce.001.1","noaa_urn:oid:2.49.0.1.840.0.146c4b974527474fa33b0164a183cfb5f07a0b83.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | NW Danville |
| Spc County | Montour |
| Spc State | PA |
| Spc Comments | Multiple trees down across Danville. (CTP) |
| Iem TypeSummary | D |
| Iem City | 0 NW Danville |
| Iem County | Montour |
| 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 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.