This alert expired on 2 September 2026 at 03:00 UTC. It is kept here as a record.
No stronger detection stands among the 65 recorded within 20 km of this point since 16 March 2026 — one other 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 9:54PM EDT until September 1 at 11:00PM EDT by NWS Mount Holly NJ
An estimated 290,674 people live within 50 km of this point.
Nearby, since 16 March 2026
- September 2, 2026 · score 49 · 6.3 km
- August 8, 2026 · score 37 · 8.9 km
- May 27, 2026 · score 43 · 9.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 49 out of 100, at 92 % 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) | 49 / 100 |
| Our confidence | 92% |
| Coordinates | 39.3038, -74.8191 |
| Nearest City | Millville (22 km) |
| Population Exposed | 290.7K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-02T01:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4fa9182e8937abbcec3f0d53efbca48e1c9fd788.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Atlantic, NJ; Cape May, NJ; Cumberland, NJ; Burlington, NJ; Ocean, NJ; Atlantic, NJ; Burlington, NJ; Cape May, NJ; Ocean, NJ and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 1 at 9:54PM EDT until September 1 at 11:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-01T23:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4fa9182e8937abbcec3f0d53efbca48e1c9fd788.001.1","noaa_urn:oid:2.49.0.1.840.0.4a98a58c7595dbb1a930db0b457699d4334e4437.001.1","noaa_urn:oid:2.49.0.1.840.0.567f9d8037dec511ff88de85be07c3cc3dde3bfd.001.1","noaa_urn:oid:2.49.0.1.840.0.e0f4071c906c77354a067cbc357f92b7f51dec9f.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 | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Williamstown |
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 Millville?
Calamity.live data shows a weather event with CalamityScore 49/100, near Millville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.