This alert expired on 23 June 2026 at 09:45 UTC. It is kept here as a record.
It is the 17th strongest of the 75 detections recorded within 20 km of this point since 12 June 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 23 at 4:01AM EDT until June 23 at 5:45AM EDT by NWS Upton NY
An estimated 18,735,606 people live within 50 km of this point.
Nearby, since 12 June 2026
- June 26, 2026 · score 52 · 7.2 km
- August 3, 2026 · score 66 · 8.0 km
- July 21, 2026 · score 76 · 10.8 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % 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 | 90% |
| Coordinates | 41.0314, -74.2681 |
| Nearest City | Wyckoff (9 km) |
| Population Exposed | 18.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-23T08:01:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e0b16d37f910bc4e83ecfe0769f306dd8b964973.002.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bergen, NJ; Passaic, NJ; Rockland, NY |
| Headline | Flash Flood Warning issued June 23 at 4:01AM EDT until June 23 at 5:45AM EDT by NWS Upton NY |
| Expires | 2026-06-23T05:45:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | 1 NNE Rockaway |
| Iem County | Morris |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | NJ State Police responded to several inches of water covering the left and center lanes of Interstate 80 near Exit 37. |
| MergedSources | [{"id":"iem_F_40.750_-74.150_1782184440000","source":"iem","severity":"low","severityValue":25,"timestamp":1782184440000,"latitude":40.75,"longitude":-74.15},{"id":"iem_F_40.910_-74.510_1782192600000","source":"iem","severity":"low","severityValue":25,"timestamp":1782192600000,"latitude":40.91,"longitude":-74.51}] |
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 Wyckoff (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.