Right now
The most recent data we hold from NOAA arrived 2 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 30 May 2026 at 06:00 UTC. It is kept here as a record.
It is one of only 2 we have recorded within 20 km of this point since 30 May 2026.
What the source measured
NOAA reported: Special Marine Warning issued May 30 at 12:58AM EDT until May 30 at 2:00AM EDT by NWS Boston/Norton MA
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 59 % 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) | 22 / 100 |
| Our confidence | 59% |
| Coordinates | 41.2360, -69.9280 |
| Nearest City | Yarmouth (58 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-30T04:58:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6f029df8f6abd42b3dd53ccde77f319070d374e9.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Nantucket Sound; Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM; Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket; Ocean Waters from Provincetown to Nantucket from 20 to 60 NM |
| Headline | Special Marine Warning issued May 30 at 12:58AM EDT until May 30 at 2:00AM EDT by NWS Boston/Norton MA |
| Expires | 2026-05-30T02:00:00-04:00 |
| 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.
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