This alert expired on 2 September 2026 at 03:00 UTC. It is kept here as a record.
It is the 44th strongest of the 91 detections recorded within 20 km of this point since 16 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 10:12PM EDT until September 1 at 11:00PM EDT by NWS Mount Holly NJ
An estimated 232,216 people live within 50 km of this point.
Nearby, since 16 March 2026
- March 17, 2026 · score 43 · 4.0 km
- July 18, 2026 · score 43 · 7.8 km
- September 2, 2026 · score 49 · 8.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 87 % 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) | 37 / 100 |
| Our confidence | 87% |
| Coordinates | 39.1360, -74.8813 |
| Nearest City | Millville (32 km) |
| Population Exposed | 232.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T02:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a008cd05635c4957ae891ecf6785d21d1d183e58.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Atlantic, NJ; Cape May, NJ; Kent, DE; Sussex, DE; Caroline, MD; Queen Anne's, MD |
| Headline | Severe Thunderstorm Warning issued September 1 at 10:12PM 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 | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a008cd05635c4957ae891ecf6785d21d1d183e58.002.1","noaa_urn:oid:2.49.0.1.840.0.756549598f56c2438135b452fd850ebd17ad94d7.002.1","noaa_urn:oid:2.49.0.1.840.0.042ed346f0c99b72e5eb599fd574189bf1778348.002.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 51 |
| Iem Unit | MPH |
| Iem City | 6 ESE Woodland Beach |
| Iem County | ANZ430 |
| Iem State | DE |
| Iem Wfo | PHI |
| Iem Remark | Station SJSN4 - Ship John Shoal gusted to 45.1 kt. |
| MergedSources | [{"id":"iem_M_39.300_-75.380_1788311880000","source":"iem","severity":"low","severityValue":25,"timestamp":1788311880000,"latitude":39.3,"longitude":-75.38}] |
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 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.