Right now
The most recent data we hold from NOAA arrived 12 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
11 other detections within 20 km in the last 24 hours, the nearest 3 km from here.
This alert expired on 22 July 2026 at 00:45 UTC. It is kept here as a record.
It is the 76th strongest of the 125 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 5:30PM EDT until July 21 at 8:45PM EDT by NWS Mount Holly NJ
An estimated 22,905,399 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 6, 2026 · score 52 · 2.6 km
- June 12, 2026 · score 46 · 3.4 km
- September 2, 2026 · score 46 · 3.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Our confidence | 79% |
| Coordinates | 40.8669, -74.4242 |
| Nearest City | Parsippany (1 km) |
| Population Exposed | 22.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T21:30:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.eae01cf4ba3e25da1f8fd85cac15f8bf |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | New Castle, DE; Burlington, NJ; Camden, NJ; Gloucester, NJ; Salem, NJ; Chester, PA; Delaware, PA; Montgomery, PA; Philadelphia, PA; Chester, PA; Delaware, PA; Hudson, NJ; Kings, NY; New York, NY; Queens, NY and 7 more areas |
| Headline | Flash Flood Warning issued July 21 at 5:30PM EDT until July 21 at 8:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T20:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eae01cf4ba3e25da1f8fd85cac15f8bf56929bac.001.1","noaa_urn:oid:2.49.0.1.840.0.3063b05388373e2950b6090905cee89c0bba2ba2.001.1","noaa_urn:oid:2.49.0.1.840.0.715d754a508814328cffb6ac641c0665e9bec213.001.1","noaa_urn:oid:2.49.0.1.840.0.707b2ad1f0c4bd0eeae7e8104d8182c181267021.001.1","noaa_urn:oid:2.49.0.1.840.0.09f87ad36671ae44019a3d186017d48fa40f0bd6.001.1","noaa_urn:oid:2.49.0.1.840.0.b0ef6fcf6aafa17ce5a0bb851b3f2f719f8b98c9.001.1","noaa_urn:oid:2.49.0.1.840.0.c312c2c99bf28cbcb3618dbc94a4238c1a4096dd.001.1","noaa_urn:oid:2.49.0.1.840.0.9e45ce87e50e91fcf54645bbe20d9d8eabfec984.001.1","noaa_urn:oid:2.49.0.1.840.0.644fa1ebdd545b023b48b7488dd4c072f9d14eeb.001.1","noaa_urn:oid:2.49.0.1.840.0.f69cd042ad8167a938448a9c4847aa09be832043.001.1"] |
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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