This alert expired on 13 August 2026 at 06:15 UTC. It is kept here as a record.
No stronger detection stands among the 27 recorded within 20 km of this point since 11 June 2026 — 8 others scored the same. The last comparable one was on 11 August 2026. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 13 at 12:47AM EDT until August 13 at 2:15AM EDT by NWS Upton NY
An estimated 1,378,461 people live within 50 km of this point.
Nearby, since 11 June 2026
- August 11, 2026 · score 52 · 9.4 km
- June 11, 2026 · score 46 · 10.0 km
- July 19, 2026 · score 52 · 11.6 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 | 41.2029, -72.6890 |
| Nearest City | Guilford (10 km) |
| Population Exposed | 1.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T04:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9f90214a9a239b80fe8c1012959015ad58721d87.001.1 |
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 |
| Headline | Special Marine Warning issued August 13 at 12:47AM EDT until August 13 at 2:15AM EDT by NWS Upton NY |
| Expires | 2026-08-13T02:15:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
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 Guilford (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.