This alert expired on 27 August 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 359 recorded within 20 km of this point since 12 March 2026 — 267 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued August 27 at 3:43PM EDT until August 27 at 7:45PM EDT by NWS Mount Holly NJ
An estimated 3,840,139 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 17, 2026 · score 52 · 3.5 km
- July 9, 2026 · score 52 · 4.1 km
- July 27, 2026 · score 52 · 4.7 km
How we know
Confirmed by 29 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % 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 | 90% |
| Coordinates | 40.2133, -74.7271 |
| Nearest City | Trenton (1 km) |
| Population Exposed | 3.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-27T19:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.7258840a95318f750ada4292e243867c |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Camden, NJ; Bergen, NJ; Essex, NJ; Hudson, NJ; Camden, NJ; Gloucester, NJ; Salem, NJ and 6 more areas |
| Headline | Flash Flood Warning issued August 27 at 3:43PM EDT until August 27 at 7:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-27T19:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7258840a95318f750ada4292e243867c2a4cba84.001.1","noaa_urn:oid:2.49.0.1.840.0.44721f1d995b1132961ac0b287d15b6616aab432.001.1","noaa_urn:oid:2.49.0.1.840.0.c1bca3d6246cca7847a4f3de981448dd0b144847.001.1","noaa_urn:oid:2.49.0.1.840.0.53408adb312b0f386498ba07ac36c8b683ef05d4.001.1","noaa_urn:oid:2.49.0.1.840.0.3d306d05eec7ef14815f8d93a5a6e423bc95fb4b.001.1","noaa_urn:oid:2.49.0.1.840.0.4d5c1449e0e5d16f3fce288ab72f526486420c39.001.1","noaa_urn:oid:2.49.0.1.840.0.9af4c0bf6739fb2e6563e5a3763ecc71e945af46.001.1","noaa_urn:oid:2.49.0.1.840.0.2ae12a92ce469a95ba5ed6e2c33f91274a18c637.001.1","noaa_urn:oid:2.49.0.1.840.0.f827e11afa35b6a83d87457620e26438e75092a3.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Huguenot |
| Spc County | Richmond |
| Spc State | NY |
| Spc Comments | Tree down on Mosely Avenue. (OKX) |
| Iem TypeSummary | R |
| Iem Magnitude | 3.47 |
| Iem Unit | Inch |
| Iem City | 1 ENE Sayreville |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.