Conditions elsewhere on the Cape can be calm and sleepy while ten foot rollers are coming into the East Coast of the Cape from a distant storm. Be aware of sea and surf conditions before venturing out onto the ocean. The East side has great fishing for Stripers, Bluefish, Mackeral, Cod, Tuna, Etc. Most boating is within sight of Chatham or Nauset lights. The Break is well bouyed but wise boaters navigating this channel would do well to take a look first from the high ground of the Chatham Light overlook.
Current can be strong, waves square and confused and sand bars close by.
Mid-tide passages are the most problematic. Watch for fog and be considerate of the passage of commercial craft. Don't fish or anchor in the channel. Remember, if you are outside and the sea conditions are deteriorating, the break will be even worse with following breaking seas easily reaching 6' tp 10'. The dividing line between Nantucket sound and the Atlantic is Monomoy Island in Chatham.