F0 • Gale tornado 40-72 mph

F1 • Moderate tornado 73-112 mph

F2 • Significant tornado 113-157 mph

F3 • Severe tornado 158-206 mph

F4 • Devastating tornado 207-260 mph

F5 • Incredible tornado 261-318 mph

F6 • Inconceivable tornado 319-379 mph