A large slow-moving area of updraught and downdraught which causes violent thunderstorms, heavy hail, and tornadoes.
- As mentioned earlier, a type of thunderstorm called a supercell creates the strongest tornadoes.
- This disturbance provides the strong vertical wind shear that gives an updraft its twisting motion, turning a normal thunderstorm into a potentially tornado spawning supercell.
- These state-of-the-art detection units allow forecasters to peek inside a supercell and look for a Tornado Vortex Signature, or TVS.
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