SAN JUAN, Puerto Rico — Hurricane Lee whirled north of Puerto Rico on Tuesday as a very large Category 3 storm, with forecasters noting it would remain in open waters through this week while on a path toward Atlantic Canada.

       The storm was located about 535 miles south of Bermuda. It had winds of up to 115 mph and was moving west-northwest at 7 mph.

       A tropical storm watch was issued for Bermuda, with Lee forecast to pass just west of the island late Thursday, the National Hurricane Center said. It noted that Lee was “a very large hurricane,” with hurricane-force winds extending up to 125 miles from the center and tropical-storm-force winds up to 240 miles.