Right now
The most recent data we hold from NOAA arrived 3 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 9 July 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 359 recorded within 20 km of this point since 12 March 2026 — 275 others scored the same. The last comparable one was on 6 July 2026. 22 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 9 at 1:37PM EDT until July 9 at 5:45PM EDT by NWS Mount Holly NJ
An estimated 2,035,200 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 5, 2026 · score 52 · 1.0 km
- August 27, 2026 · score 52 · 1.4 km
- August 27, 2026 · score 52 · 5.3 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 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 52 / 100 |
| Our confidence | 81% |
| Coordinates | 40.3021, -74.6760 |
| Nearest City | Princeton (6 km) |
| Population Exposed | 2.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-09T17:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.1bc9b4b07157d0524825689cc0e71892 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | New Castle, DE; Gloucester, NJ; Salem, NJ; Delaware, PA; Hunterdon, NJ; Mercer, NJ; Middlesex, NJ; Somerset, NJ; Kings, NY; Richmond, NY |
| Headline | Flash Flood Warning issued July 9 at 1:37PM EDT until July 9 at 5:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-09T17:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1bc9b4b07157d0524825689cc0e718922429f625.001.1","noaa_urn:oid:2.49.0.1.840.0.7d5e5c4840e783b074e6bebdf79e70c2195d3d1d.001.1","noaa_urn:oid:2.49.0.1.840.0.6ed9bef4e9d60f18d2ec4d7dc8e176d37ac52ab6.001.1"] |
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.
Want to know when something happens near Princeton?
Calamity.live data shows a weather event with CalamityScore 52/100, near Princeton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.