This alert expired on 22 June 2026 at 21:00 UTC. It is kept here as a record.
It is the 34th strongest of the 150 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 22 at 4:15PM EDT until June 22 at 5:00PM EDT by NWS Mount Holly NJ
An estimated 340,574 people live within 50 km of this point.
Nearby, since 17 March 2026
- June 22, 2026 · score 72 · 8.0 km
- July 21, 2026 · score 37 · 9.2 km
- June 22, 2026 · score 43 · 10.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 82 % 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) | 43 / 100 |
| Our confidence | 82% |
| Coordinates | 40.1206, -75.8919 |
| Nearest City | Reading (25 km) |
| Population Exposed | 340.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-22T20:15:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Berks, PA; Chester, PA; Delaware, PA; Montgomery, PA; Lancaster, PA |
| Headline | Severe Thunderstorm Warning issued June 22 at 4:15PM EDT until June 22 at 5:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-22T17:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.35b02911659314f44316f7f9817a2e2170705e38.001.1","noaa_urn:oid:2.49.0.1.840.0.17c2d8fc58a9c339f22ff8da95872f1ca593a81c.001.1"] |
| Iem TypeSummary | D |
| Iem City | Holmesburg |
| Iem County | Philadelphia |
| Iem State | PA |
| Iem Wfo | PHI |
| Iem Remark | Multiple large tree branches and a tree snapped. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_40.040_-75.030_1782152640000","source":"iem","severity":"low","severityValue":25,"timestamp":1782152640000,"latitude":40.04,"longitude":-75.03}] |
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 43/100, near Reading (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.