Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 20 May 2026 at 22:45 UTC. It is kept here as a record.
It is the 5th strongest of the 205 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 20 at 6:34PM EDT until May 20 at 6:45PM EDT by NWS Mount Holly NJ
An estimated 2,303,105 people live within 50 km of this point.
Nearby, since 12 March 2026
- May 20, 2026 · score 52 · 5.5 km
- July 27, 2026 · score 52 · 5.6 km
- July 18, 2026 · score 52 · 5.7 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 84 % 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 | 84% |
| Coordinates | 40.1957, -74.4244 |
| Nearest City | Marlboro (20 km) |
| Population Exposed | 2.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T22:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3030fcaa16a8fc408f18415dfeb60757 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Burlington, NJ; Camden, NJ; Middlesex, NJ; Monmouth, NJ; Morris, NJ; Somerset, NJ; Burlington, NJ; Mercer, NJ; Middlesex, NJ; Monmouth, NJ; Ocean, NJ; Somerset, NJ and 3 more areas |
| Headline | Severe Thunderstorm Warning issued May 20 at 6:34PM 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 | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3030fcaa16a8fc408f18415dfeb60757f3a73bcc.002.1","noaa_urn:oid:2.49.0.1.840.0.a33b22f3f3a9efca318e4f633e961ede03e65d27.002.1","noaa_urn:oid:2.49.0.1.840.0.01121919ec9897f3f6bfd866f7ea45253bf34b9c.001.1","noaa_urn:oid:2.49.0.1.840.0.1db25976eddd37a8008d3de1bbaa7d86a86dc174.001.1","noaa_urn:oid:2.49.0.1.840.0.8ea5f565181056ad4e412ffede8fa275295d8aae.001.1","noaa_urn:oid:2.49.0.1.840.0.2514391dfa47852a43db0d380c500bbb11b1c684.001.1"] |
| Iem TypeSummary | D |
| Iem City | Bordentown |
| Iem County | Burlington |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Several wires down across Bordentown and Chesterfield. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_40.140_-74.710_1779314760000","source":"iem","severity":"low","severityValue":25,"timestamp":1779314760000,"latitude":40.14,"longitude":-74.71}] |
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 Marlboro?
Calamity.live data shows a weather event with CalamityScore 52/100, near Marlboro (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.