Right now
The most recent data we hold from NOAA arrived 20 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 29 July 2026 at 03:35 UTC. It is kept here as a record.
It is the 10th strongest of the 94 detections recorded within 20 km of this point since 6 June 2026. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 28 at 11:25PM EDT until July 28 at 11:30PM EDT by NWS Mount Holly NJ
Urban PEI: 801,040 within a heuristic 50 km radius; not unique people.
Nearby, since 6 June 2026
- July 21, 2026 · score 41 · 1.9 km
- July 28, 2026 · score 52 · 14.4 km
- July 6, 2026 · score 52 · 14.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 40.7392, -74.9371 |
| Nearest City | Easton (24 km) |
| Urban exposure index (PEI) | 801.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-29T03:25:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.2c5742c0cb9a1f31977f91545f95c127 |
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: 2026-07-29T03:25:00.000Z.
First archived: 2026-07-29T03:28:38.349Z. 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 | Chester, PA; Bergen, NJ; Essex, NJ; Passaic, NJ; Berks, PA; Montgomery, PA and 9 more areas |
| Headline | Flash Flood Warning issued July 28 at 11:25PM EDT until July 28 at 11:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-28T23:35:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2c5742c0cb9a1f31977f91545f95c1279d47f0a6.001.1","noaa_urn:oid:2.49.0.1.840.0.803e964958d3a3877808668a00e1d944d3f3ad37.001.1","noaa_urn:oid:2.49.0.1.840.0.cb5aa8de0140548e5388fd6f9cea01c17e20e3ed.001.1","noaa_urn:oid:2.49.0.1.840.0.93a7e0899c224a3ba781b7f558b16f8def72d8d2.001.1","noaa_urn:oid:2.49.0.1.840.0.0dd353243becadcb3fc5b3dbcf8f3ff560a6e233.001.1","noaa_urn:oid:2.49.0.1.840.0.fb0580860dd2ebc4446f2fb7d2922c6924cdcd11.001.1","noaa_urn:oid:2.49.0.1.840.0.2fbb6bb3f3d7c57e876b40efa1787fd21dccd99a.001.1","noaa_urn:oid:2.49.0.1.840.0.1b60a0b3d5ae149fedbfe2bc92651e9ed5a59c4a.001.1","noaa_urn:oid:2.49.0.1.840.0.b764d9fd2afc0b5317defb11d3dc243178689ed3.001.1","noaa_urn:oid:2.49.0.1.840.0.7206ec9c4c761489bae322c0399f0ed084a9c887.001.1","noaa_urn:oid:2.49.0.1.840.0.a873cb2be33df41c440cd4b8af9dd773b3d42359.001.1","noaa_urn:oid:2.49.0.1.840.0.52c9b65cf2a223f12721c875fbe9b9355ce18a3d.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.
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