Tornado outbreaks typically occur when a lengthy collision zone forms between ________ results in the formation of many supercell thunderstorms.
A. a single-cell thunderstorm and a snowstorm
B. three or more hook echos
C. warm high-pressure air mass and a cold high-pressure air mass
D. a cold front and a high-energy warm air mass
E. three or more warm fronts
Answer: D
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