A New Jersey man was in good condition after being injured Sunday morning while riding his personal watercraft in Greenport Harbor, officials said.

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Matthew Alvarez, 21, of Cranbury, N.J., was injured while attempting to cross a boat's wake just before 10 a.m., Southold police said. He made it to the dock at the nearby Claudio's Clam Bar, where he was treated by Greenport Fire's rescue team.

A Suffolk police helicopter then airlifted Alvarez to Stony Brook University Medical Center for further treatment. Neither Southold police nor Greenport fire officials provided additional details on the accident Sunday afternoon.