This alert expired on 12 June 2026 at 04:00 UTC. It is kept here as a record.
It is the 180th strongest of the 313 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 6 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 11 at 10:38PM EDT until June 12 at 12:00AM EDT by NWS Mount Holly NJ
An estimated 3,206,353 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 8, 2026 · score 52 · 8.9 km
- August 28, 2026 · score 46 · 9.4 km
- August 27, 2026 · score 52 · 9.4 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 | 39.6500, -75.3667 |
| Nearest City | Wilmington (19 km) |
| Population Exposed | 3.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T02:38:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.7d9c04b95b4f7201095b1f5de101527a |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Delaware Bay waters north of East Point NJ to Slaughter Beach DE; Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM; Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 NM; Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 NM; Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM; Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM; Atlantic, NJ; Burlington, NJ; Camden, NJ; Cape May, NJ; Cumberland, NJ; Gloucester, NJ; Hunterdon, NJ; Mercer, NJ; Middlesex, NJ; Monmouth, NJ; Morris, NJ; Ocean, NJ; Salem, NJ; Somerset, NJ; Sussex, NJ; Warren, NJ; Bucks, PA; Delaware, PA; Montgomery, PA; Philadelphia, PA; Calvert, MD; Cecil, MD; Charles, MD; St. Marys, MD; King George, VA; Stafford, VA and 3 more areas |
| Headline | Severe Thunderstorm Watch issued June 11 at 10:38PM EDT until June 12 at 12:00AM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-12T00:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | false |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7d9c04b95b4f7201095b1f5de101527a1793bfad.003.1","noaa_urn:oid:2.49.0.1.840.0.7d9c04b95b4f7201095b1f5de101527a1793bfad.002.1","noaa_urn:oid:2.49.0.1.840.0.f37f5b21334ac7136593b5c301876ab3517597f3.003.1","noaa_urn:oid:2.49.0.1.840.0.f37f5b21334ac7136593b5c301876ab3517597f3.004.1","noaa_urn:oid:2.49.0.1.840.0.06aee1665b2a443edd7ff2d5c89813dfd546f2b6.001.1","noaa_urn:oid:2.49.0.1.840.0.06aee1665b2a443edd7ff2d5c89813dfd546f2b6.002.1"] |
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 Wilmington (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.