Conditions Necessary to Turn an Ordinary Thunderstorm into a Tornado-Spinning

question 4

Multiple Choice

Conditions necessary to turn an ordinary thunderstorm into a tornado-spinning monster include _______________.

• A)a low-altitude,northerly flow of warm,humid,tropical air from the Gulf of Mexico
• B)a cold,dry air mass moving down from Canada or out of the Rocky Mountains at > 50 mph
• C)jet-stream winds racing east at speeds in excess of 150 mph
• D)All of the choices are correct.
• E)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

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