This alert expired on 2 September 2026 at 01:15 UTC. It is kept here as a record.
No stronger detection stands among the 268 recorded within 20 km of this point since 12 March 2026 — 6 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 1 at 8:58PM EDT until September 1 at 9:15PM EDT by NWS Mount Holly NJ
An estimated 3,465,243 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 10, 2026 · score 52 · 4.0 km
- July 9, 2026 · score 52 · 4.0 km
- August 28, 2026 · score 46 · 6.3 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 58 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 | high |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 91% |
| Coordinates | 39.6665, -75.2036 |
| Nearest City | Glassboro (9 km) |
| Population Exposed | 3.5M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-02T00:58:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a001682ec47eaf4f85f91ef9720d6b9bde9d3e9f.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Atlantic, NJ; Camden, NJ; Cumberland, NJ; Gloucester, NJ; Camden, NJ; Gloucester, NJ; Salem, NJ; New Castle, DE; Cumberland, NJ; Gloucester, NJ; Salem, NJ; Chester, PA and 3 more areas |
| Headline | Severe Thunderstorm Warning issued September 1 at 8:58PM EDT until September 1 at 9:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-01T21:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a001682ec47eaf4f85f91ef9720d6b9bde9d3e9f.001.1","noaa_urn:oid:2.49.0.1.840.0.b53d15b89abc430402fa62b4484f0ac36811f878.001.1","noaa_urn:oid:2.49.0.1.840.0.ee70acbe055ee5c342766bbff8fc28e6203b99c3.002.1","noaa_urn:oid:2.49.0.1.840.0.92d57f162e0d6ca097ba3d9ea97dbb99230f416c.002.1","noaa_urn:oid:2.49.0.1.840.0.ec353fbaee5025a33c27fa3ed5f43359c13b3517.001.1","noaa_urn:oid:2.49.0.1.840.0.8f8e06df2a0ad74494ebeccb7477ae59bc9e1b97.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | Williamstown |
| Spc County | Gloucester |
| Spc State | NJ |
| Spc Comments | Quarter size hail reported in Williamstown. (PHI) |
| Iem TypeSummary | D |
| Iem City | West Bradford Twp |
| Iem County | Chester |
| 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 Glassboro?
Calamity.live data shows a weather event with CalamityScore 58/100, near Glassboro (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.