This alert expired on 26 June 2026 at 07:51 UTC. It is kept here as a record.
It is the 16th strongest of the 57 detections recorded within 20 km of this point since 12 June 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 26 at 3:41AM EDT until June 26 at 3:45AM EDT by NWS Upton NY
An estimated 17,580,478 people live within 50 km of this point.
Nearby, since 12 June 2026
- June 23, 2026 · score 52 · 7.2 km
- July 21, 2026 · score 46 · 11.4 km
- July 21, 2026 · score 76 · 12.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 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) | 52 / 100 |
| Our confidence | 80% |
| Coordinates | 41.0952, -74.2519 |
| Nearest City | Mahwah (9 km) |
| Population Exposed | 17.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-26T07:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.99257523a313c18ecef2a42369cb1ce75136d520.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bergen, NJ; Passaic, NJ; Orange, NY; Rockland, NY |
| Headline | Flash Flood Warning issued June 26 at 3:41AM EDT until June 26 at 3:45AM EDT by NWS Upton NY |
| Expires | 2026-06-26T03:51:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
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 52/100, near Mahwah (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.