MIKE SPRINGER/Staff photo
Bill Lee, captain of the Ocean Reporter, examined some of the thick seaweed clogging Rockport's inner harbor Tuesday. Lee said the event was the result of easterly winds carrying seaweed dislodged by last week's unusually high tides into shore. "It happens about once every ten years," he said. Last Friday and Saturday there was a perigean spring tide, which occurs when the moon's perigee -- its closest point to earth during it's 28-day orbit -- coincides with a spring tide, when the Earth, moon and Sun are nearly aligned. As for the seaweed in Rockport Harbor, Lee expected it to be carried back out by Westerly winds, beginning today.