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Special Marine Warning for Cape Cod Bay; Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary; Massachusetts Bay and Ipswich Bay

This alert has ended.Kept for recent context. Do not use it as a current warning.

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What you need to know

Effective
Ended
Official severity
Severe
Official urgency
Immediate
Official certainty
Likely

What is happening

For the following areas... Cape Cod Bay... Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary... Massachusetts Bay and Ipswich Bay... At 312 PM EDT, a severe thunderstorm capable of producing waterspouts was located near Wellfleet Harbor, moving southeast at 20 knots....

What the bulletin says to do

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.

Read official NWS bulletin

Full official description

Bulletin details

For the following areas... Cape Cod Bay... Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary... Massachusetts Bay and Ipswich Bay... At 312 PM EDT, a severe thunderstorm capable of producing waterspouts was located near Wellfleet Harbor, moving southeast at 20 knots. HAZARD...Waterspouts and wind gusts to 40 knots. SOURCE...Radar indicated. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Small craft could be damaged in briefly higher winds and suddenly higher waves. Locations impacted include... Wellfleet Harbor, Cape Cod Bay, North Eastham, and Manomet Point.

Lifecycle record

Official revisions

2 captured
  1. Update

    Special Marine Warning issued August 13 at 3:12PM EDT until August 13 at 3:30PM EDT by NWS Boston/Norton MA

    Official revision
  2. Alert

    Special Marine Warning issued August 13 at 2:37PM EDT until August 13 at 3:30PM EDT by NWS Boston/Norton MA

    Official revision

Source and limitations

Publisher: Weather Alert Watch. Primary source: NWS Boston/Norton MA. This page reorganizes official fields and does not add a forecast or expand the affected area.

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Message type
Update
Last collected
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