This alert expired on 5 July 2026 at 00:15 UTC. It is kept here as a record.
It is the 24th strongest of the 147 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 7:09PM EDT until July 4 at 8:15PM EDT by NWS Mount Holly NJ
An estimated 249,990 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 21, 2026 · score 37 · 12.2 km
- March 17, 2026 · score 43 · 12.4 km
- June 15, 2026 · score 43 · 13.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 89 % 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 | 89% |
| Coordinates | 40.2564, -76.0026 |
| Nearest City | Reading (11 km) |
| Population Exposed | 250.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T23:09:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Carbon, PA; Monroe, PA; Dauphin, PA; Lancaster, PA; Lebanon, PA; Schuylkill, PA; York, PA; Sullivan, NY and 24 more areas |
| Headline | Severe Thunderstorm Warning issued July 4 at 7:09PM EDT until July 4 at 8:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-04T20:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 28 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.32a21f89ae12cb83185c8a8a454d7431ae040da3.001.1","noaa_urn:oid:2.49.0.1.840.0.911099a83431b9239de70a5409587929832d918b.001.1","noaa_urn:oid:2.49.0.1.840.0.be4843e5b0588205cfc3eb78cdf64c2cbaad1ff2.001.1","noaa_urn:oid:2.49.0.1.840.0.759ee7c3b4e12d9f8437d66e77639a6bd989ef9a.002.1","noaa_urn:oid:2.49.0.1.840.0.67ce5c3cf91f259555d0d5d96903e7fa084a02e2.001.1","noaa_urn:oid:2.49.0.1.840.0.4b88ae320fcce95c5cecfaf52de676dee5bb795a.001.1","noaa_urn:oid:2.49.0.1.840.0.ecbcd16cfa2c3be945501bf1df2a872d799bae97.001.1","noaa_urn:oid:2.49.0.1.840.0.eae0c56c2c5f555a33fe748368f8e969c76b745f.001.1","noaa_urn:oid:2.49.0.1.840.0.59174c1f5b4af89517566d3da0282e42a23f70a4.001.1","noaa_urn:oid:2.49.0.1.840.0.d2aa155eae04612e1827371281edbe6aaccfdef5.001.1","noaa_urn:oid:2.49.0.1.840.0.d2de090d9852e3c0d237a3855e5a3a1c28bb8b78.002.1","noaa_urn:oid:2.49.0.1.840.0.c8affde78f3106d4c1e0f98f608447f61c27c77c.001.1","noaa_urn:oid:2.49.0.1.840.0.dea2634c5e7a303144de179aa4fa2c4490f40c0c.001.1","noaa_urn:oid:2.49.0.1.840.0.6e8fc0f754c61c136b22b8173a678be74ca6a1e9.001.1","noaa_urn:oid:2.49.0.1.840.0.dc0306bec74bf63dffad1f27ddbcb7edc6055824.001.1","noaa_urn:oid:2.49.0.1.840.0.1aee4af03e096062062474ec569ee8fc1c8819e7.002.1","noaa_urn:oid:2.49.0.1.840.0.79289cc46fc29e0a354e57d144c919c2dacdc8b9.001.1","noaa_urn:oid:2.49.0.1.840.0.a87ddab614371e8e0cb6291c62ab53cfb2245cba.001.1","noaa_urn:oid:2.49.0.1.840.0.bc56a8eb233ccb3f04776b68c79cee592ac04783.001.1","noaa_urn:oid:2.49.0.1.840.0.387cec28806225e508b302c302aea1ae5bb715fa.001.1","noaa_urn:oid:2.49.0.1.840.0.d46ab000e827c8b3518eb05b98a7e14ae69ec134.001.1","noaa_urn:oid:2.49.0.1.840.0.8fddeb9116067e650553fde6c70ee084f54605de.001.1","noaa_urn:oid:2.49.0.1.840.0.ac1e2141d184c3c1d1bc9179b55c0ae8866c5045.001.1","noaa_urn:oid:2.49.0.1.840.0.f45f276329f77333a63db1cba37bfea8f30cb702.001.1","noaa_urn:oid:2.49.0.1.840.0.2ab629bc316e95c70691b5f25f99b68206841ac4.002.1","noaa_urn:oid:2.49.0.1.840.0.d5dae68daf0a2a343f85b359c7cfdc685ba34ff5.001.1","noaa_urn:oid:2.49.0.1.840.0.b023052f9a27a82a96192406d4beafdb908d31bb.001.1","noaa_urn:oid:2.49.0.1.840.0.433b19a4a1ce5e258544626e1950d97079ebd9e8.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 65 |
| Iem Unit | MPH |
| Iem City | 2 WSW Middletown |
| Iem County | Dauphin |
| Iem State | PA |
| Iem Wfo | CTP |
| Iem Remark | KMDT 57KT Gust. |
| MergedSources | [{"id":"iem_G_40.220_-76.850_1783205520000","source":"iem","severity":"low","severityValue":25,"timestamp":1783205520000,"latitude":40.22,"longitude":-76.85},{"id":"iem_G_40.190_-76.760_1783205580000","source":"iem","severity":"low","severityValue":25,"timestamp":1783205580000,"latitude":40.19,"longitude":-76.76}] |
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.