Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 23 June 2026 at 09:15 UTC. It is kept here as a record.
It is the 6th strongest of the 89 detections recorded within 20 km of this point since 12 June 2026. The last comparable one was on 18 June 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 23 at 1:11AM EDT until June 23 at 5:15AM EDT by NWS Mount Holly NJ
Urban PEI: 522,926 within a heuristic 50 km radius; not unique people.
Nearby, since 12 June 2026
- July 15, 2026 · score 48 · 9.5 km
- July 29, 2026 · score 48 · 11.9 km
- July 21, 2026 · score 41 · 12.1 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 48 / 100 |
| Legacy data-support index | 0.84/1 |
| Coordinates | 40.8371, -74.9240 |
| Nearest City | Hopatcong Hills (24 km) |
| Urban exposure index (PEI) | 522.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-23T05:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.342e8eec3b8711edeb85a9e3e59702fa |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-23T05:11:00.000Z.
First archived: 2026-06-23T06:09:55.791Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Morris, NJ; Sussex, NJ; Northampton, PA |
| Headline | Flash Flood Warning issued June 23 at 1:11AM EDT until June 23 at 5:15AM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-23T05:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.342e8eec3b8711edeb85a9e3e59702faae50938a.001.1","noaa_urn:oid:2.49.0.1.840.0.15ee6a7ea639a3b7a8ca70e16d4049063a7d9d5f.001.1"] |
| Iem TypeSummary | F |
| Iem City | Harrison |
| Iem County | Hudson |
| Iem State | NJ |
| Iem Wfo | OKX |
| Iem Remark | Flooded basement. |
| MergedSources | [{"id":"iem_F_40.750_-74.150_1782184440000","source":"iem","severity":"low","severityValue":25,"timestamp":1782184440000,"latitude":40.75,"longitude":-74.15}] |
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.
Review the area, threshold and delivery channel in your account.
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