This alert expired on 2 July 2026 at 07:30 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 2 July 2026.
What the source measured
NOAA reported: Special Marine Warning issued July 2 at 2:30AM EDT until July 2 at 3:30AM EDT by NWS Boston/Norton MA
An estimated 73,064 people live within 50 km of this point.
Nearby, since 2 July 2026
- July 19, 2026 · score 39 · 14.1 km
- August 13, 2026 · score 39 · 24.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 81 % 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) | 39 / 100 |
| Our confidence | 81% |
| Coordinates | 41.7445, -70.0045 |
| Nearest City | Yarmouth (19 km) |
| Population Exposed | 73.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-02T06:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.44657ef3497d9305ef22b2a3f2304001214a003a.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Cape Cod Bay; Nantucket Sound; Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM |
| Headline | Special Marine Warning issued July 2 at 2:30AM EDT until July 2 at 3:30AM EDT by NWS Boston/Norton MA |
| Expires | 2026-07-02T03:30:00-04:00 |
| 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 near Yarmouth?
Calamity.live data shows a weather event with CalamityScore 39/100, near Yarmouth (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.