This alert expired on 21 July 2026 at 19:00 UTC. It is kept here as a record.
It is the 25th strongest of the 48 detections recorded within 20 km of this point since 6 June 2026. The last comparable one was on 15 July 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 2:45PM EDT until July 21 at 3:00PM EDT by NWS Mount Holly NJ
An estimated 978,041 people live within 50 km of this point.
Nearby, since 6 June 2026
- July 28, 2026 · score 52 · 12.6 km
- July 6, 2026 · score 52 · 12.8 km
- July 21, 2026 · score 46 · 14.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 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) | 41 / 100 |
| Our confidence | 79% |
| Coordinates | 40.7286, -74.9200 |
| Nearest City | Easton (26 km) |
| Population Exposed | 978.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T18:45:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8365201b6d1a1f1c35251e577cf3c58b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Berks, PA; Lehigh, PA; Bergen, NJ; Essex, NJ; Passaic, NJ |
| Headline | Severe Thunderstorm Warning issued July 21 at 2:45PM EDT until July 21 at 3:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T15:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8365201b6d1a1f1c35251e577cf3c58b6f7f01a9.001.1","noaa_urn:oid:2.49.0.1.840.0.7739ac1f412b51c8d1bc4db879a4ce2a8184ea12.001.1"] |
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 41/100, near Easton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.