This alert expired on 2 September 2026 at 17:45 UTC. It is kept here as a record.
It is the 16th strongest of the 31 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 12:40PM EDT until September 2 at 1:45PM EDT by NWS Mount Holly NJ
An estimated 698,432 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 5, 2026 · score 48 · 4.8 km
- May 20, 2026 · score 48 · 12.1 km
- September 2, 2026 · score 37 · 14.5 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 41 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 41 / 100 |
| Our confidence | 87% |
| Coordinates | 39.7572, -76.4222 |
| Nearest City | Bel Air North (23 km) |
| Population Exposed | 698.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T16:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a892123a9b34cd9fa1df34e56d175cc82bc5e3fa.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chester, PA; Anne Arundel, MD; Baltimore, MD; Carroll, MD; Cecil, MD; Harford, MD; Howard, MD; Baltimore City, MD; Lancaster, PA; Lebanon, PA; York, PA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 2 at 12:40PM EDT until September 2 at 1:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-02T13:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a892123a9b34cd9fa1df34e56d175cc82bc5e3fa.001.1","noaa_urn:oid:2.49.0.1.840.0.b0139972e0903682e1b97451d7327c851b485e4a.001.1","noaa_urn:oid:2.49.0.1.840.0.b5c098433f8553a27ad7b8da6542aba7a83d0800.002.1","noaa_urn:oid:2.49.0.1.840.0.8db0f15e0545d2e3435ab51595e3c4209e30da5a.001.1","noaa_urn:oid:2.49.0.1.840.0.a50467a7116eba9107bb4689e4cd2e0973419db1.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 3 NW Codorus |
| Spc County | York |
| Spc State | PA |
| Spc Comments | Tree and wires down blocking road at intersection of Bungalow Road and Waltersdorff Road. (CTP) |
| MergedSources | [{"id":"spc_wind_39.87_-76.94_27","source":"spc","severity":"medium","severityValue":45,"timestamp":1788364800000,"latitude":39.87,"longitude":-76.94},{"id":"spc_wind_39.83_-76.87_28","source":"spc","severity":"medium","severityValue":45,"timestamp":1788365220000,"latitude":39.83,"longitude":-76.87}] |
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 8 March 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.
Want to know when something happens near Bel Air North?
Calamity.live data shows a weather event with CalamityScore 41/100, near Bel Air North (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.