This alert expired on 13 August 2026 at 07:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 38 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 19 July 2026. One more was 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 597,911 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 13, 2026 · score 52 · 14.2 km
- July 5, 2026 · score 48 · 14.8 km
- March 17, 2026 · score 43 · 15.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 80% |
| Coordinates | 40.9633, -72.5695 |
| Nearest City | Mastic (29 km) |
| Population Exposed | 597.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T06:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.390f0226fe19df7db2ae4412034b5d207dd3b942.001.1 |
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; 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 |
| 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 |
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.
Want to know when something happens near Mastic?
Calamity.live data shows a weather event with CalamityScore 48/100, near Mastic (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.