Right now
The most recent data we hold from NOAA arrived 63 minutes ago, and this point is in it.
2 other detections within 20 km in the last 24 hours, the nearest 18 km from here.
This alert is in force until 28 September 2026, 07:30 UTC.
It is one of only 3 we have recorded within 20 km of this point since 17 March 2026. The last comparable one was on 27 September 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 27 at 3:29PM EDT until September 29 at 8:00AM EDT by NWS Mount Holly NJ
Urban PEI: 3,168,933 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- June 6, 2026 · 6.1 km
- March 17, 2026 · 6.3 km
- August 7, 2026 · 8.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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 v5. 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 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 40.4800, -74.5857 |
| Nearest City | Hillsborough (4 km) |
| Urban exposure index (PEI) | 3.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-28T05:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.965dd741fa0b3d6ef93bdb182f5bce72d39c1368.001.1 |
Physical priority index · v5. 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: 2026-09-28T05:27:00.000Z.
First archived: 2026-09-27T19:34:36.004Z. 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 | Flood Warning |
| MessageId | urn:oid:2.49.0.1.840.0.965dd741fa0b3d6ef93bdb182f5bce72d39c1368.001.1 |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Somerset, NJ |
| Headline | Flood Warning issued September 27 at 3:29PM EDT until September 29 at 8:00AM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-28T03:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| 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 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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