This alert expired on 13 August 2026 at 07:00 UTC. It is kept here as a record.
No stronger detection stands among the 22 recorded within 20 km of this point since 11 June 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 13 at 2:06AM EDT until August 13 at 3:00AM EDT by NWS Upton NY
An estimated 1,083,393 people live within 50 km of this point.
Nearby, since 11 June 2026
- July 5, 2026 · score 48 · 7.7 km
- July 19, 2026 · score 52 · 11.3 km
- June 11, 2026 · score 46 · 14.2 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 80% |
| Coordinates | 41.0831, -72.6293 |
| Nearest City | Madison (22 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T06:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.390f0226fe19df7db2ae4412034b5d20 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Long Island Sound East of New Haven CT/Port Jefferson NY to the Mouth of the Connecticut River; Long Island Sound East of the Mouth of the Connecticut River; Long Island Sound West of New Haven CT/Port Jefferson NY; Peconic and Gardiners Bays; South Shore Bays from Jones Inlet through Shinnecock Bay; Moriches Inlet NY to Montauk Point NY out 20 NM; Fire Island Inlet NY to Moriches Inlet NY out 20 NM; Long Island Sound East of New Haven CT/Port Jefferson NY to the Mouth of the Connecticut River; Long Island Sound East of the Mouth of the Connecticut River; Long Island Sound West of New Haven CT/Port Jefferson NY |
| Headline | Special Marine Warning issued August 13 at 2:06AM EDT until August 13 at 3:00AM EDT by NWS Upton NY |
| Expires | 2026-08-13T03:00:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.390f0226fe19df7db2ae4412034b5d207dd3b942.001.1","noaa_urn:oid:2.49.0.1.840.0.9f90214a9a239b80fe8c1012959015ad58721d87.001.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 10 February 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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Madison (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.