Special Marine Warning
N
Issued by NWS Boston/Norton MA
⏳ In force until Fri 13 Nov, 04:15 📍 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM; Coastal Waters extending out to 25 NM Sout… (approximate) 🕑 1 h ago
SMWBOX The National Weather Service in Boston/Norton has issued a * Special Marine Warning for... Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket... Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM... Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM... Ocean Waters from Provincetown to Nantucket from 20 to 60 NM... * Until 8…
🗃 Archived report - it is no longer on the live map. Pages are kept for 30 days.
📡 CAP alert details
Common Alerting Protocol
Official alert linked
▾
📡 CAP alert details
Common Alerting Protocol
⚠
SeveritySevere
⏱
UrgencyImmediate
❓
CertaintyLikely
EventSpecial Marine Warning
Response typeAvoid
CategoryMet
Affected areaCoastal 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
Issuing authorityNWS Boston/Norton MA
ContactNot supplied
🕓 Alert timing · EAT
Sent2026-11-12T19:12:00-05:00
Effective2026-11-12T19:12:00-05:00
Onset2026-11-12T19:12:00-05:00
Expires2026-11-12T20:15:00-05:00
📋 Official instructions
Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.📄 Message details
Alert identifierurn:oid:2.49.0.1.840.0.7a11febafb5c0e6c7b68dc84ffd5562d7508ed5c.001.1
Message typeAlert
Senderw-nws.webmaster@noaa.gov
ScopePublic
CAP statusActual
Related messagesNot supplied
ⓘ CAP fields populate when an official alert is linked.
🛡 Safety advice
General guidance for this type of incident - not official instructions.
- Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.
- Stay aware of your surroundings in this area.
- Follow official updates from the police and local authorities.
- In an emergency call 112 (police) or 112 (ambulance), or request help through Jilinde.
📰 Story summary
From the report shown in the feed:
- SMWBOX The National Weather Service in Boston/Norton has issued a * Special Marine Warning for...
- Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket...
- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM...
- Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM...
- Ocean Waters from Provincetown to Nantucket from 20 to 60 NM...
- * Until 8…
ⓘ News summary · read the original report for full context.
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