This alert expired on 21 July 2026 at 22:18 UTC. It is kept here as a record.
It is the 75th strongest of the 124 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 6:08PM EDT until July 21 at 6:15PM EDT by NWS Mount Holly NJ
An estimated 2,620,303 people live within 50 km of this point.
Nearby, since 11 March 2026
- March 17, 2026 · score 52 · 5.7 km
- July 27, 2026 · score 52 · 8.1 km
- July 6, 2026 · score 52 · 8.8 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 79 % 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 | 79% |
| Coordinates | 39.5106, -75.2649 |
| Nearest City | Bridgeton (9 km) |
| Population Exposed | 2.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T22:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8e7ed8de4c39001e249cf8a8289ad89b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Gloucester, NJ; Salem, NJ; Burlington, NJ; Ocean, NJ; Kent, DE; New Castle, DE; Kent, MD; Queen Anne's, MD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 6:08PM EDT until July 21 at 6:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T18:18:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8e7ed8de4c39001e249cf8a8289ad89b69ff38aa.001.1","noaa_urn:oid:2.49.0.1.840.0.c96ea0cd14f0c6e8fb1210a5b144ab4d75836ada.001.1","noaa_urn:oid:2.49.0.1.840.0.94d1fb53d1497302b03e7ab31aa91258287be4ff.001.1","noaa_urn:oid:2.49.0.1.840.0.a32e6b1ad3eef668ed03ea1650352f6dbb92343f.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 Bridgeton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.