Conditions necessary to turn an ordinary thunderstorm into a tornado-spinning monster include ________.
A. a cold, dry air mass moving down from Canada or out of the Rocky Mountains at > 50 mph
B. a low-altitude, northerly flow of warm, humid, tropical air from the Gulf of Mexico and a cold, dry air mass moving down from Canada or out of the Rocky Mountains at > 50 mph only
C. jet-stream winds racing east at speeds in excess of 150 mph
D. All of these choices are correct.
E. a low-altitude, northerly flow of warm, humid, tropical air from the Gulf of Mexico
Answer: D
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