This alert expired on 27 August 2026 at 22:15 UTC. It is kept here as a record.
It is the 249th strongest of the 325 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued August 27 at 5:13PM EDT until August 27 at 6:15PM EDT by NWS Mount Holly NJ
An estimated 1,930,014 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 3, 2026 · score 46 · 4.1 km
- August 3, 2026 · score 46 · 4.3 km
- August 7, 2026 · score 52 · 4.7 km
How we know
Confirmed by 43 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 88 % 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 | 88% |
| Coordinates | 40.3543, -74.7880 |
| Nearest City | Ewing (9 km) |
| Population Exposed | 1.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-27T21:13:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.700ba33c6c096bde689ae02f97c88319 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Mercer, NJ; Somerset, NJ; Bucks, PA; Bergen, NJ; Essex, NJ; Hudson, NJ; Chester, PA; Montgomery, PA and 5 more areas |
| Headline | Flash Flood Warning issued August 27 at 5:13PM EDT until August 27 at 6:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-27T18:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.700ba33c6c096bde689ae02f97c88319e3b2ce30.001.1","noaa_urn:oid:2.49.0.1.840.0.9e69f83fb8a732b7d10447386b15580727509009.001.1","noaa_urn:oid:2.49.0.1.840.0.6f7fd96026376c3ea17015cf1600408b58a52446.001.1","noaa_urn:oid:2.49.0.1.840.0.290a4e15ba86e355ba420d02698331bda9b1802e.001.1","noaa_urn:oid:2.49.0.1.840.0.7258840a95318f750ada4292e243867c2a4cba84.001.1","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"] |
| 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 Ewing?
Calamity.live data shows a weather event with CalamityScore 46/100, near Ewing (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.