Each year, U.S. fire departments respond to more than ____ fires started by lightning in the United States.
a. 2,000
b. 50,000
c. 10,000
d. 20,000
e. 50,000
Q. 2Many flash floods, including the one that occurred in Colorado's Big Thompson Canyon, are the result of thunderstorms that
a. contain no lightning.
b. form in a dry air mass.
c. move slowly.
d. have weak or non-existent downdrafts.
e. lack the dissipating stage.
Q. 3Squall lines generally do not form
a. behind a cold front.
b. when the air aloft develops waves downwind from a cold front.
c. along a cold front.
d. in the warm sector where warm, dry air meets warm, humid air.
e. ahead of an advancing cold front.
Q. 4During the summer, what conditions prevail near the surface over the Great Plains that help a hailstone survive as ice all the way to the ground?
a. strong updrafts
b. weak updraftsdry air
c. dry air
d. a rapid change in pressure
e. a rapid change in temperature
Q. 5The wind shear associated with several major airline crashes is believed to have been caused by
a. microbursts.
b. dry lines.
c. the jet stream.
d. mesocyclones.
e. the jet streak.
Q. 6A small thunderstorm cloud with virga falling out of its base and blowing dust at the ground could warn of a severe hazard to an airplane because
a. this could be the first indication of a tornado.
b. it is likely that hail will soon begin to fall.
c. this could indicate an intense downdraft or microburst.
d. the airplane could be struck by lightning.
e. a hurricane is close by.
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