This alert expired on 15 June 2026 at 02:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 150 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 6 June 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 14 at 9:39PM EDT until June 14 at 10:00PM EDT by NWS Mount Holly NJ
An estimated 195,416 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 4, 2026 · score 43 · 12.9 km
- July 4, 2026 · score 43 · 13.1 km
- August 28, 2026 · score 67 · 13.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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 | 81% |
| Coordinates | 40.2215, -76.1502 |
| Nearest City | Reading (23 km) |
| Population Exposed | 195.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-15T01:39:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chester, PA; Baltimore, MD; Cecil, MD; Harford, MD; Lycoming, PA; Sullivan, PA |
| Headline | Severe Thunderstorm Warning issued June 14 at 9:39PM EDT until June 14 at 10:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-14T22:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c6f52252ac52e35dc3192be96dca9b342697d13e.001.1","noaa_urn:oid:2.49.0.1.840.0.cd79cf3d0f3a60fd58792163cf531592cdc0f9d8.001.1","noaa_urn:oid:2.49.0.1.840.0.14012779f6a4fd83d6d67b66ae176598cd08966f.002.1"] |
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 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.