Right now
The most recent data we hold from NOAA arrived 6 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 21 July 2026 at 23:00 UTC. It is kept here as a record.
It is the 45th strongest of the 67 detections recorded within 20 km of this point since 20 May 2026. The last comparable one was on 7 July 2026.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 2:49PM EDT until July 21 at 7:00PM EDT by NWS Mount Holly NJ
An estimated 1,562,798 people live within 50 km of this point.
Nearby, since 20 May 2026
- August 3, 2026 · score 66 · 4.5 km
- August 8, 2026 · score 52 · 10.4 km
- July 21, 2026 · score 46 · 14.6 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, 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) | 46 / 100 |
| Our confidence | 80% |
| Coordinates | 41.3548, -73.6597 |
| Nearest City | Danbury (18 km) |
| Population Exposed | 1.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T18:49:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.2a0d52052d48ca435e1a3e6d885d1a1d |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Morris, NJ; Sullivan, NY; Wayne, PA; Middlesex, CT; New Haven, CT; New London, CT and 1 more areas |
| Headline | Flash Flood Warning issued July 21 at 2:49PM EDT until July 21 at 7:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T19:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2a0d52052d48ca435e1a3e6d885d1a1db52ff303.001.1","noaa_urn:oid:2.49.0.1.840.0.8b322d9b64c3bd27e94ae01b96c72e8b5c97166c.001.1","noaa_urn:oid:2.49.0.1.840.0.62e57cace57768369f29fe2a609372c4cbb37f03.001.1","noaa_urn:oid:2.49.0.1.840.0.94ce487d57a57ada126f9368138477b5907ae092.001.1"] |
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 Danbury?
Calamity.live data shows a weather event with CalamityScore 46/100, near Danbury (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.