This alert expired on 4 September 2026 at 08:00 UTC. It is kept here as a record.
It is one of only 4 we have recorded within 20 km of this point since 5 July 2026. The last comparable one was on 13 August 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 4 at 3:06AM EDT until September 4 at 4:00AM EDT by NWS Boston/Norton MA
An estimated 79,608 people live within 50 km of this point.
Nearby, since 5 July 2026
- August 13, 2026 · score 43 · 5.9 km
- September 4, 2026 · score 32 · 7.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 32 / 100 |
| Our confidence | 82% |
| Coordinates | 41.0163, -71.8482 |
| Nearest City | Westerly (40 km) |
| Population Exposed | 79.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T07:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.225afe4f93fb07862bf8a7494da9a5c336231cd9.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Rhode Island Sound; Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket; Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island; South Shore Bays from Jones Inlet through Shinnecock Bay; Moriches Inlet NY to Montauk Point NY out 20 NM |
| Headline | Special Marine Warning issued September 4 at 3:06AM EDT until September 4 at 4:00AM EDT by NWS Boston/Norton MA |
| Expires | 2026-09-04T04:00:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.225afe4f93fb07862bf8a7494da9a5c336231cd9.001.1","noaa_urn:oid:2.49.0.1.840.0.52398634ee6742166e48eb2c25831dd03c403ba9.001.1"] |
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 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 32/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.