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 18 July 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 318 recorded within 20 km of this point since 12 March 2026 — 236 others scored the same. Another comparable one was recorded here earlier the same day. 19 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 18 at 3:44PM EDT until July 18 at 7:45PM EDT by NWS Mount Holly NJ
An estimated 2,547,444 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 27, 2026 · score 52 · 4.5 km
- August 27, 2026 · score 52 · 5.5 km
- July 9, 2026 · score 52 · 6.7 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.
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 | 80% |
| Coordinates | 40.3100, -74.5975 |
| Nearest City | Princeton (7 km) |
| Population Exposed | 2.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T19:44:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.f5db492a763ed3436fc12c284df8c215 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Middlesex, NJ; Monmouth, NJ; Ocean, NJ; Mercer, NJ; Bucks, PA; Hunterdon, NJ; Mercer, NJ; Middlesex, NJ; Monmouth, NJ and 2 more areas |
| Headline | Flash Flood Warning issued July 18 at 3:44PM EDT until July 18 at 7:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-18T19:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f5db492a763ed3436fc12c284df8c2150049d13c.001.1","noaa_urn:oid:2.49.0.1.840.0.01608990aac92903e7997d6f20ac4da7497d24a4.001.1","noaa_urn:oid:2.49.0.1.840.0.ceac9fa89abca0e7eb8ef87a58e63ab750d8d7e5.001.1","noaa_urn:oid:2.49.0.1.840.0.2dbf563a00efccf5b47193132fc6e7613dfc22c3.001.1","noaa_urn:oid:2.49.0.1.840.0.c00c085f29902a65d5a15a85f41f7f2ea4625fdc.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.