The appearance of ________ marks the beginning of the ________ stage of an ordinary cell thunderstorm.
a. a downdraft, initial
b. precipitation, dissipating
c. a thermal, dissipating
d. a downdraft, mature
Question 2Ordinary cell thunderstorms form in areas with:
a. significant wind shear.
b. frontal boundaries.
c. limited wind shear.
d. None of these choices.
Question 3Which of the following is not a trigger to start air moving upward?
a. Radiational cooling.
b. Warm air rising along a frontal boundary.
c. Unequal surface heating.
d. Converging surface winds.
Question 4Strong convergence occurs throughout the area of a typical jet streak.
Indicate whether the statement is true or false
Question 5Cyclogenesis often occurs in the Gulf of Mexico.
Indicate whether the statement is true or false
Question 6The National Weather Service issues a blizzard warning only when high winds and visibility-reducing snow are expected to exist for at least three hours.
Indicate whether the statement is true or false
Question 7Convergence is indicated on upper level charts when:
a. contour lines move toward each other.
b. contour lines move apart from each other.
c. contour lines are parallel.
d. None of these choices.
Question 8A jet streak is a maximum in ________ within a jet stream.
a. precipitation
b. wind speed
c. pressure
d. temperature
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