On 4 July 2003, beachgoers at Warren Dunes State Park, in the US state of Michigan, were enjoying America’s Independence Day holiday when a fast-moving line of thunderstorms blew in from Lake Michigan. They scurried for shelter, but the event passed so quickly it didn’t appear that their holiday was ruined. “In 15 minutes it was gone,” says civil engineer Alvaro Linares of the University of Wisconsin, Madison.
Office of Strategic Communication