• A veteran storm chaser explains the different shapes and sizes of tornadoes, from mile-wide wedges to narrow ropes.
• Types of tornadoes include wedge tornadoes, multi-vortex tornadoes with subvortexes, drill bit tornadoes, and invisible tornadoes.
• Rare 'wrong-way' tornadoes spin clockwise, unlike the typical counterclockwise rotation in the Northern Hemisphere.