Calamity
mediumSevere weatherCalamity Score: 28

Severe Weather near Williamsport

NorthumberlandUnited StatesNOAA

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 9 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 6:50PM EDT until September 1 at 7:30PM EDT by NWS Upton NY

An estimated 29,201 people live within 50 km of this point.

Nearby, since 3 July 2026

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

TypeSevere weather
Severitymedium
Calamity Score (ours)28 / 100
Our confidence91%
Coordinates41.0277, -76.8253
Nearest CityWilliamsport (28 km)
Population Exposed29.2K within 50 km
Impact Tiersignificant
Timestamp2026-09-01T22:50:00.000Z
Sourcehttps://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.421cb5a1278c2497bdb107f7d2b1253f8c977b4a.001.1

Score Breakdown

35
intensity
40
population
0
cascading
18
historical

Technical Details

EventSevere Thunderstorm Warning
UrgencyImmediate
CertaintyObserved
AreaDescEssex, NJ; Union, NJ; Richmond, NY; Berks, PA and 10 more areas
HeadlineSevere Thunderstorm Warning issued September 1 at 6:50PM EDT until September 1 at 7:30PM EDT by NWS Upton NY
Expires2026-09-01T19:30:00-04:00
SenderNameNWS Upton NY
HasExactCoordstrue
MergedCount14
MergedIds["noaa_urn:oid:2.49.0.1.840.0.421cb5a1278c2497bdb107f7d2b1253f8c977b4a.001.1","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:2.49.0.1.840.0.36a89618053e638043e10a53a5a682aa4c7e2e28.002.1","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 ReportTypewind
Spc SpeedUNK
Spc Location3 NW Danville
Spc CountyMontour
Spc StatePA
Spc CommentsLarge tree and wires down in the vicinity of Mooresburg causing widespread power outages. (CTP)
Iem TypeSummaryD
Iem City4 SW Lairdsville
Iem CountyLycoming
Iem StatePA

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.

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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.