This alert expired on 2 September 2026 at 01:00 UTC. It is kept here as a record.
It is the 199th strongest of the 329 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 1 at 8:28PM EDT until September 1 at 9:00PM EDT by NWS Mount Holly NJ
An estimated 3,697,810 people live within 50 km of this point.
Nearby, since 12 March 2026
- September 2, 2026 · score 46 · 0.0 km
- August 27, 2026 · score 52 · 5.2 km
- July 6, 2026 · score 52 · 5.7 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 46 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) | 46 / 100 |
| Our confidence | 90% |
| Coordinates | 39.7677, -75.1999 |
| Nearest City | Sewell (5 km) |
| Population Exposed | 3.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T00:28:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4154e29d505421065c138620f3b1b9e99d412b47.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Burlington, NJ; Mercer, NJ; Middlesex, NJ; Monmouth, NJ; Ocean, NJ; Atlantic, NJ; Camden, NJ; Cumberland, NJ; Gloucester, NJ; New Castle, DE; Cumberland, NJ; Gloucester, NJ; Salem, NJ; Chester, PA; Delaware, PA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 1 at 8:28PM EDT until September 1 at 9:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-01T21:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4154e29d505421065c138620f3b1b9e99d412b47.001.1","noaa_urn:oid:2.49.0.1.840.0.d86ccc23a65db7a604f44ae1c4ee48358eeb7512.001.1","noaa_urn:oid:2.49.0.1.840.0.19948bd3f13684e5bb40f1a69f8c104003ffba19.001.1","noaa_urn:oid:2.49.0.1.840.0.50f3adbd456f6e8f64499d81f9611fa908acdb40.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 WSW West Nantmeal Twp |
| Spc County | Chester |
| Spc State | PA |
| Spc Comments | tree was blown down on Morgantown Road... blocking traffic. (PHI) |
| Google News RssFeed | weather |
| Google News SourceName | CBS News |
| MergedSources | [{"id":"spc_wind_40.12_-75.86_34","source":"spc","severity":"medium","severityValue":45,"timestamp":1788308968086,"latitude":40.12,"longitude":-75.86},{"id":"gnews_weather_496748_252","source":"google_news","severity":"medium","severityValue":40,"timestamp":1788294959000,"latitude":39.95,"longitude":-75.16}] |
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 Sewell?
Calamity.live data shows a weather event with CalamityScore 46/100, near Sewell (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.