Corey A. Smith was working on a sailboat in Chatham on Tuesday when a powerful storm hit and caused chaos in the harbor. As fierce winds blew and boats capsized around him, Smith captured some dramatic moments on video.

“I’m very fortunate,’’ said Smith, 27. “Thank God I was on a well-built boat.’’

The storm generated an EF-1 tornado that touched down in Yarmouth and Harwich, packing 110-mile-per-hour winds. Chatham and other towns in the area were hit with high winds and heavy rains.