Taken from said Citizen article:
"The Marine Patrol says the boat overturned just before 9 a.m., after running into strong winds and rough water that came over the bow. Winds gusts at the time were recorded in excess of 20 mph, according to the National Weather Service automatic weather data station at the Laconia Airport."
In other news, winnfabs has announced they plan to propose a law limiting wind speeds on Winni to 10 mph during the day and 5 mph at night.