They are mainly categorized for their destruction, but also their wind speeds (which the amount of destruction tells you). This is on a scale called the Enhanced Fujita scale:
EF-0: 65-85 MPH, minor roof damage, weak branches broken off trees.
EF-1: 86-110 MPH, roofs severely damaged, glass windows broken.
EF-2: 111-135 MPH, Roofs are torn off well built houses, trees are uprooted.
EF-3: 136-165 MPH, strong homes largely destroyed, trains derailed.
EF-4: 166-200 MPH, strong homes leveled, objects made into missiles.
EF-5: over 200 MPH, Houses completely blown away, usually very large, completely tears away everything in its path.
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how do tornadoes stop ? how are tornadoes formed? These are good example questions.
Tornadoes are most common in temperate or subtropical climates.
Resting Inertia and Moving Inertia
by air, water,sunlight & CO2