Tornado twists its way through Mississippi city -- Tornadic waterspouts devastate Italian island -- St. Louis, Missouri, flattened by powerful twister -- Tri-state tornado batters Missouri, Illinois, and Indiana -- Twister blasts Dhaka district of Bangladesh -- Gainesville, Georgia, leveled by twin twisters -- Oklahoma town nearly wiped out by tornado -- New England's worst tornado wreaks destruction -- Twister injures tens of thousands of Bangladeshis -- Joplin, Missouri, decimated by EF5 tornado -- Supercell spawns monster Oklahoma twister -- Bangladesh hit by history's deadliest tornado -- Staying safe if there is a tornado -- Glossary.