This alert expired on 22 June 2026 at 21:30 UTC. It is kept here as a record.
No stronger detection stands among the 230 recorded within 20 km of this point since 14 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 22 at 4:56PM EDT until June 22 at 5:30PM EDT by NWS Mount Holly NJ
An estimated 3,070,074 people live within 50 km of this point.
Nearby, since 14 March 2026
- June 22, 2026 · score 76 · 8.3 km
- July 11, 2026 · score 52 · 11.0 km
- March 17, 2026 · score 52 · 11.5 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 76 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 87% |
| Coordinates | 40.0720, -75.6390 |
| Nearest City | West Chester (13 km) |
| Population Exposed | 3.1M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-06-22T20:56:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chester, PA; Delaware, PA; Montgomery, PA |
| Headline | Tornado Warning issued June 22 at 4:56PM EDT until June 22 at 5:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-22T17:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8ff87f28f0299a1a5c3311114250d5468ccdc587.001.1","noaa_urn:oid:2.49.0.1.840.0.f0b214a782fb12cf6003cb49fed4761369cfc842.002.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 1 NE Burlington Twp |
| Iem County | Burlington |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | 2 minutes of hail up to 1.5 inch diameter. Time estimated from radar. |
| Google News RssFeed | weather |
| Google News SourceName | CBS News |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 76/100, near West Chester (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.