This alert expired on 1 September 2026 at 23:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 15 detections recorded within 20 km of this point since 3 July 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 1 at 6:52PM EDT until September 1 at 7:30PM EDT by NWS Mount Holly NJ
An estimated 29,201 people live within 50 km of this point.
Nearby, since 3 July 2026
- September 1, 2026 · score 46 · 19.6 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 91% |
| Coordinates | 40.9971, -76.6574 |
| Nearest City | Williamsport (39 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-01T22:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7c99b9267e08bc0bfefeff018a097fdd5161e5a6.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Middlesex, NJ; Monmouth, NJ; Morris, NJ; Somerset, NJ; Essex, NJ; Union, NJ; Luzerne, PA and 11 more areas |
| Headline | Severe Thunderstorm Warning issued September 1 at 6:52PM EDT until September 1 at 7:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-01T19:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 15 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7c99b9267e08bc0bfefeff018a097fdd5161e5a6.001.1","noaa_urn:oid:2.49.0.1.840.0.421cb5a1278c2497bdb107f7d2b1253f8c977b4a.001.1","noaa_urn:oid:2.49.0.1.840.0.36a89618053e638043e10a53a5a682aa4c7e2e28.002.1","noaa_urn:oid:2.49.0.1.840.0.a1b687372190b06c2ce635a29eaef864c9c8452c.002.1","noaa_urn:oid:2.49.0.1.840.0.f9dfac33d16ba91aebd33a37ca8421a04f3a11fd.001.1","noaa_urn:oid:2.49.0.1.840.0.f88be3c5f42d3e888dbd1aef43d0809449ef9a27.001.1","noaa_urn:oid:2.49.0.1.840.0.a9129d7372441f6969dc1767ce9d9a45c3b4ab31.001.1","noaa_urn:oid:2.49.0.1.840.0.68f478da9451244a21fa2c1f4119ce54ff907b73.001.1","noaa_urn:oid:2.49.0.1.840.0.cdee9e91bb0fd9f1fdd7a83d2c0e8caeae82170e.001.1","noaa_urn:oid:2.49.0.1.840.0.875a55868904f91bb2b3dcad606c14006ba4aa12.001.1","noaa_urn:oid:2.49.0.1.840.0.1efaaf9233d2b3c353b0356231dd561c9d6f33c5.001.1","noaa_urn:oid:2.49.0.1.840.0.a5819415e2b80e469aaaca0f190c9e71683dc9e0.001.1","noaa_urn:oid:2.49.0.1.840.0.36e6cae897e445f26afd569c0da5a606eb7480d2.001.1","noaa_urn:oid:2.49.0.1.840.0.dcd652a78455a7763967a1ab22896da0bd1a5455.001.1","noaa_urn:oid:2.49.0.1.840.0.4233b21bb6690f53c389eb3a2e2a3ec3345ea66b.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 3 NW Danville |
| Spc County | Montour |
| Spc State | PA |
| Spc Comments | Large tree and wires down in the vicinity of Mooresburg causing widespread power outages. (CTP) |
| Iem TypeSummary | D |
| Iem City | 4 SW Lairdsville |
| 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 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 in this area?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.