Right now
The most recent data we hold from NOAA arrived 16 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 19:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 38 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 12:23PM EDT until July 21 at 3:30PM EDT by NWS Upton NY
An estimated 4,861,611 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 21, 2026 · score 52 · 5.0 km
- June 6, 2026 · score 52 · 7.1 km
- June 12, 2026 · score 52 · 7.1 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 | 41.1486, -73.4494 |
| Nearest City | New Canaan (3 km) |
| Population Exposed | 4.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T16:23:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.66eecc3248fe8099e096427c4ee7ba95 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Fairfield, CT; Westchester, NY; Fairfield, CT; New Haven, CT |
| Headline | Flash Flood Warning issued July 21 at 12:23PM EDT until July 21 at 3:30PM EDT by NWS Upton NY |
| Expires | 2026-07-21T15:30:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.66eecc3248fe8099e096427c4ee7ba95757c29ed.001.1","noaa_urn:oid:2.49.0.1.840.0.f0a8876fa82628d73f3b7be2a5ea69b5d515c966.001.1","noaa_urn:oid:2.49.0.1.840.0.794295906cad5a2a374868e27dc5707753829473.001.1"] |
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.
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