This alert expired on 13 August 2026 at 11:15 UTC. It is kept here as a record.
No stronger detection stands among the 13 recorded within 20 km of this point since 16 March 2026 — 2 others scored the same. The last comparable one was on 30 July 2026.
What the source measured
NOAA reported: Special Marine Warning issued August 13 at 6:20AM EDT until August 13 at 7:15AM EDT by NWS Boston/Norton MA
An estimated 134,207 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 5, 2026 · score 39 · 11.0 km
- September 4, 2026 · score 37 · 14.9 km
- September 4, 2026 · score 32 · 15.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 41.1417, -71.3717 |
| Nearest City | Narragansett (35 km) |
| Population Exposed | 134.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T10:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8b3a900ac61d65f399437c0a37fa785add4ebc97.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Rhode Island Sound; Block Island Sound; Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island; Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM |
| Headline | Special Marine Warning issued August 13 at 6:20AM EDT until August 13 at 7:15AM EDT by NWS Boston/Norton MA |
| Expires | 2026-08-13T07:15:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| 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 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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.