This alert expired on 12 June 2026 at 03:00 UTC. It is kept here as a record.
It is the 72nd strongest of the 113 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 6 June 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 10:21PM EDT until June 11 at 11:00PM EDT by NWS Mount Holly NJ
An estimated 2,565,688 people live within 50 km of this point.
Nearby, since 12 March 2026
- June 12, 2026 · score 46 · 4.3 km
- June 6, 2026 · score 52 · 4.3 km
- August 6, 2026 · score 58 · 4.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 80 % 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 | 80% |
| Coordinates | 40.7181, -74.7021 |
| Nearest City | Basking Ridge (13 km) |
| Population Exposed | 2.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T02:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ae62b29d9327a6b7df6a2105826acc40 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Burlington, NJ; Camden, NJ; Delaware, PA; Montgomery, PA; Philadelphia, PA; Morris, NJ; Sussex, NJ |
| Headline | Severe Thunderstorm Warning issued June 11 at 10:21PM EDT until June 11 at 11:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-11T23:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ae62b29d9327a6b7df6a2105826acc40642a5c1e.001.1","noaa_urn:oid:2.49.0.1.840.0.9cec9494eb264727578cba531ec90ac935d6dec5.002.1","noaa_urn:oid:2.49.0.1.840.0.038a3d37a1968269367f046b711086edb80b5901.001.1"] |
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.
Calamity.live data shows a weather event with CalamityScore 46/100, near Basking Ridge (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.