This alert expired on 20 May 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 407 recorded within 20 km of this point since 12 March 2026 — 323 others scored the same. 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 May 20 at 6:12PM EDT until May 20 at 6:45PM EDT by NWS Mount Holly NJ
An estimated 3,837,605 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 28, 2026 · score 52 · 0.6 km
- July 5, 2026 · score 52 · 1.6 km
- June 15, 2026 · score 52 · 3.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 40.1680, -74.7155 |
| Nearest City | Trenton (6 km) |
| Population Exposed | 3.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T22:12:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1db25976eddd37a8008d3de1bbaa7d86 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Ocean, NJ; Cecil, MD; Atlantic, NJ; Burlington, NJ; Camden, NJ; Gloucester, NJ; Ocean, NJ; Delaware, PA; Philadelphia, PA and 9 more areas |
| Headline | Severe Thunderstorm Warning issued May 20 at 6:12PM EDT until May 20 at 6:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-05-20T18:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1db25976eddd37a8008d3de1bbaa7d86a86dc174.001.1","noaa_urn:oid:2.49.0.1.840.0.9bf9b971d4aecc655285ecd009f0ea657d46bdc1.001.1","noaa_urn:oid:2.49.0.1.840.0.8ea5f565181056ad4e412ffede8fa275295d8aae.001.1","noaa_urn:oid:2.49.0.1.840.0.2514391dfa47852a43db0d380c500bbb11b1c684.001.1","noaa_urn:oid:2.49.0.1.840.0.059cf6a47edb39c51a68aef04e66ddb907519110.001.1","noaa_urn:oid:2.49.0.1.840.0.a75831fea722d2c91be1b5908c6ca84bb63ae516.002.1","noaa_urn:oid:2.49.0.1.840.0.911088494ed9b852130a5add7a3006d88fae19a1.001.1","noaa_urn:oid:2.49.0.1.840.0.8a4724365378ea58527a1d78e6eb1dc371f8a4f7.001.1","noaa_urn:oid:2.49.0.1.840.0.24b8461e194fe6f32814b0c260e899ee71a7547d.001.1","noaa_urn:oid:2.49.0.1.840.0.f125f3f2eec65d5a8ffc50003da44daf911134e8.002.1","noaa_urn:oid:2.49.0.1.840.0.03ca2d190fbe860996183302a8034e96194dcd54.001.1","noaa_urn:oid:2.49.0.1.840.0.3a9a720f13f0650d3faa5fad38ae28ac92c2cde7.001.1"] |
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 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 Trenton?
Calamity.live data shows a weather event with CalamityScore 52/100, near Trenton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.