Why do most tornadoes in the central U.S. occur during the spring months?
A) Solar energy is a maximum.
B) Air-mass contrasts are greatest.
C) Surface air is most humid.
D) Divergence of air aloft is greatest.
E) Upper-air temperatures are warmest.
Question 2
Which of the numbers listed below best represents the percentage of thunderstorms that produce tornadoes?
A) nearly 25 percent B) slightly more than 50 percent
C) fewer than 1 percent D) about 10 percent