Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 July 2026 at 22:51 UTC. It is kept here as a record.
It is the 145th strongest of the 198 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 18 July 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 6:42PM EDT until July 21 at 6:45PM EDT by NWS Mount Holly NJ
An estimated 3,279,322 people live within 50 km of this point.
Nearby, since 12 March 2026
- May 20, 2026 · score 52 · 5.0 km
- March 17, 2026 · score 52 · 7.2 km
- July 27, 2026 · score 52 · 7.7 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.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 79% |
| Coordinates | 39.6943, -74.8461 |
| Nearest City | Jackson (10 km) |
| Population Exposed | 3.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T22:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4eaaa8674dedb894b54b53a1cbdca73b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Ocean, NJ; Kent, DE; New Castle, DE; Kent, MD; Atlantic, NJ; Burlington, NJ; Ocean, NJ |
| Headline | Severe Thunderstorm Warning issued July 21 at 6:42PM EDT until July 21 at 6:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T18:51:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4eaaa8674dedb894b54b53a1cbdca73bd4106087.001.1","noaa_urn:oid:2.49.0.1.840.0.06b7ca6737a3f8da21cdc438197443abff9de4f2.001.1","noaa_urn:oid:2.49.0.1.840.0.70204ceaa6ddc755e7cb380318e61a8c4f206368.001.1"] |
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 8 March 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 Jackson?
Calamity.live data shows a weather event with CalamityScore 46/100, near Jackson (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.