This alert expired on 3 August 2026 at 14:00 UTC. It is kept here as a record.
No stronger detection stands among the 306 recorded within 20 km of this point since 12 March 2026 — 4 others scored the same. 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 August 3 at 8:53AM EDT until August 3 at 10:00AM EDT by NWS Mount Holly NJ
An estimated 27,393,244 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 18, 2026 · score 52 · 6.2 km
- July 18, 2026 · score 52 · 6.3 km
- July 6, 2026 · score 52 · 6.7 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 66 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 66 / 100 |
| Our confidence | 92% |
| Coordinates | 40.6163, -74.1525 |
| Nearest City | Graniteville (0 km) |
| Population Exposed | 27.4M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-08-03T12:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.d2e6800cfa14bc8570ae6a5fdfbe25bf |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Middlesex, NJ; Somerset, NJ; Essex, NJ; Hudson, NJ; Union, NJ; Bronx, NY; Kings, NY; Nassau, NY; New York, NY; Queens, NY; Richmond, NY |
| Headline | Flash Flood Warning issued August 3 at 8:53AM EDT until August 3 at 10:00AM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-03T10:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d2e6800cfa14bc8570ae6a5fdfbe25bfa03b42b1.001.1","noaa_urn:oid:2.49.0.1.840.0.68ec86a25b60139b95ad96a122ce96ab12d006cd.001.1"] |
| Iem TypeSummary | O |
| Iem City | 2 NNW Armonk |
| Iem County | Westchester |
| Iem State | NY |
| Iem Wfo | OKX |
| Iem Remark | DOT Tree Down on NY 128 northbound at Hollow Ridge Rd (New Castle) alternate lanes of 2 lanes blocked. |
| Ogimet StationId | 72530 |
| Ogimet WindSpeed | 94 |
| Ogimet WindUnit | knots |
| Ogimet Temperature | 17.2 |
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.
Calamity.live data shows a weather event with CalamityScore 66/100, near Graniteville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.