Right now
The most recent data we hold from NOAA arrived 16 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 28 July 2026 at 01:45 UTC. It is kept here as a record.
No stronger detection stands among the 374 recorded within 20 km of this point since 12 March 2026 — 268 others scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 27 at 6:35PM EDT until July 27 at 9:45PM EDT by NWS Upton NY
Urban PEI: 3,665,992 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- March 17, 2026 · score 52 · 1.7 km
- August 27, 2026 · score 52 · 4.7 km
- July 9, 2026 · score 52 · 5.9 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.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 40.2539, -74.7407 |
| Nearest City | Trenton (4 km) |
| Urban exposure index (PEI) | 3.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-27T22:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.1a1e17e69d31b7dd30f37a9b75c00fd6 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-27T22:35:00.000Z.
First archived: 2026-07-27T22:58:21.267Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bergen, NJ; Passaic, NJ; Atlantic, NJ; Bergen, NJ; Rockland, NY and 3 more areas |
| Headline | Flash Flood Warning issued July 27 at 6:35PM EDT until July 27 at 9:45PM EDT by NWS Upton NY |
| Expires | 2026-07-27T21:45:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1a1e17e69d31b7dd30f37a9b75c00fd66f03aaa7.001.1","noaa_urn:oid:2.49.0.1.840.0.9791da853050074a35161ccfb52f19f6bf2a079d.001.1","noaa_urn:oid:2.49.0.1.840.0.7de32dbbdaca0d9172d6027ebd084c6872dd9e12.001.1","noaa_urn:oid:2.49.0.1.840.0.d0618fbe1ceb99739a848f5289965779fa213d94.001.1","noaa_urn:oid:2.49.0.1.840.0.1b3c48ba6956b9c712bd0be949b3a765271fcb1f.001.1","noaa_urn:oid:2.49.0.1.840.0.ca7b873bbfe4ca14f559ebfb6e132cd50edd3c06.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens near Trenton?