5/31: Violent weather takes aim at the heartland; Couple's love story like a fairy tale

      |Nine tornadoes touched down in Oklahoma over the last 24 hours, while thunderstorms, high winds and heavy rain hit parts of Wisconsin, Illinois and Iowa. More severe weather is forecasted for Friday night and into the weekend; and Steve Hartman meets 81-year-old Cynthia Riggs and 91-year-old Howard Attebery, a couple whose love story is a tale of romance and intrigue over 60 years in the making.