This alert expired on 8 August 2026 at 00:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 117 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 40 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 7 at 5:34PM EDT until August 7 at 8:30PM EDT by NWS Mount Holly NJ
An estimated 400,352 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 28, 2026 · score 43 · 2.1 km
- September 1, 2026 · score 37 · 3.7 km
- July 21, 2026 · score 37 · 7.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 40.6446, -75.5492 |
| Nearest City | Whitehall Township (5 km) |
| Population Exposed | 400.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-07T21:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.d65b911c78b8bf1257f65d6d47af4e65 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Burlington, NJ; Mercer, NJ; Bucks, PA; Baltimore, MD; Baltimore City, MD; Hunterdon, NJ; Morris, NJ; Somerset, NJ; Sussex, NJ and 12 more areas |
| Headline | Flash Flood Warning issued August 7 at 5:34PM EDT until August 7 at 8:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-07T20:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 16 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d65b911c78b8bf1257f65d6d47af4e65781bbd84.001.1","noaa_urn:oid:2.49.0.1.840.0.4651051274684ef31c5d062a5ab6426f3d3e6aa9.001.1","noaa_urn:oid:2.49.0.1.840.0.e2778e540dd3c1cfc05055bddcc942c8a7809363.001.1","noaa_urn:oid:2.49.0.1.840.0.cd4729a020497949f5ffc5867c8b05b5e65d739f.001.1","noaa_urn:oid:2.49.0.1.840.0.1bd10011d775e347902837e55ddec8e8f1316b1c.001.1","noaa_urn:oid:2.49.0.1.840.0.00f1876b158b2605b030e9efc78f7513996266cf.001.1","noaa_urn:oid:2.49.0.1.840.0.f0b64bbe5a54a06e03ba5a737252cc54ea98d843.001.1","noaa_urn:oid:2.49.0.1.840.0.28f453b6309252a87793871920ff45dc8f8d5ef2.001.1","noaa_urn:oid:2.49.0.1.840.0.b7ef4630c43c4f594afa66b4313e65f64bfee346.001.1","noaa_urn:oid:2.49.0.1.840.0.9c02e968c55899766f8177b714a9b0833d905a56.001.1","noaa_urn:oid:2.49.0.1.840.0.14606ea67c24dcae066495777594bd03967e419a.001.1","noaa_urn:oid:2.49.0.1.840.0.1f36db1536d558d3351bf1af21a03afbd875166a.001.1","noaa_urn:oid:2.49.0.1.840.0.dbe568fc25495e75ebf882dfbf9df0dc780ff14a.001.1","noaa_urn:oid:2.49.0.1.840.0.b97f580d0f5224ef46f21edae3fbd213b813bac8.001.1","noaa_urn:oid:2.49.0.1.840.0.3ce0b9b0a354d5b6b12bbbb8998914ea0ede9056.001.1","noaa_urn:oid:2.49.0.1.840.0.50ff540a356604d30fec75a9e0adac529074040a.002.1"] |
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 10 February 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 Whitehall Township?
Calamity.live data shows a weather event with CalamityScore 43/100, near Whitehall Township (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.