Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 13 September 2026 at 14:30 UTC. It is kept here as a record.
What the source measured
NOAA reported: Flash Flood Warning issued September 13 at 7:38AM EDT until September 13 at 10:30AM EDT by NWS Upton NY
Urban PEI: 27,740,720 within a heuristic 50 km radius; not unique people.
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 v4. 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 | 40.9540, -73.9187 |
| Nearest City | Yonkers (3 km) |
| Urban exposure index (PEI) | 27.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-13T11:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8646837359e8c01208214d62d9d045c7aae02660.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-13T11:38:00.000Z.
First archived: 2026-09-13T11:41:41.155Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Fairfield, CT; Westchester, NY; Morris, NJ; Fairfield, CT and 1 more areas |
| Headline | Flash Flood Warning issued September 13 at 7:38AM EDT until September 13 at 10:30AM EDT by NWS Upton NY |
| Expires | 2026-09-13T10:30:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8646837359e8c01208214d62d9d045c7aae02660.001.1","noaa_urn:oid:2.49.0.1.840.0.fe1ec66b605097eee8dd3f0373b9d0a4d7a723fb.001.1","noaa_urn:oid:2.49.0.1.840.0.be16deab50623738ac9f58d6e84eeb7653a13674.001.1","noaa_urn:oid:2.49.0.1.840.0.b53a35a0012acb4e2f8c03a0a12033d67876d345.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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