 The biggest recorded hailstone in U.S. history fell near Vivian, South Dakota in 2010. Eight inches diameter, just shy of two pounds. All it takes to damage your vehicle is hail as small as a penny. When hail happens, remember, Marv's Body Shop will take care of you. A two-pound hailstone? That's a nice-sized fish. More like a whale. Whales are mammals, Mark. And hailstones are ice, Evan.