Right now
The most recent data we hold from NOAA arrived 1 minute 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 5 July 2026 at 05:30 UTC. It is kept here as a record.
It is the only one we have recorded within 20 km of this point since 5 July 2026.
What the source measured
NOAA reported: Special Marine Warning issued July 4 at 11:55PM EDT until July 5 at 1:30AM 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.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 40.9078, -69.5125 |
| Nearest City | Yarmouth (107 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-05T03:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.3c77b3a98a14205e43863889d983a72e |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-05T03:55:00.000Z.
First archived: 2026-07-05T04:15:02.847Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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; Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM; 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; Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM |
| Headline | Special Marine Warning issued July 4 at 11:55PM EDT until July 5 at 1:30AM EDT by NWS Boston/Norton MA |
| Expires | 2026-07-05T01:30:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3c77b3a98a14205e43863889d983a72e21c54cd4.001.1","noaa_urn:oid:2.49.0.1.840.0.c2f87e35c5800141eb4e953b641dfdb56814de89.002.1"] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?