The Independence Day holiday is the beginning of peak swimming season in Minnesota. But already a number of drownings have occurred. In the past two weeks, a 25-year-old St. Paul man drowned in Lake Phalen when he tried to retrieve a frisbee, a 23-year-old man drowned in Carver County's Lake Ann, a woman in her 40s was found submerged in a lagoon on Minneapolis' Lake of the Isles and a 14-year-old boy drowned when he tried to swim across the St. Croix River. Barb Pierce is a Water Safety Specialist with the Minneapolis Red Cross. She thinks the weather has played a role in the drownings.