Precipitation creates a _______ motion in the surrounding air.
A. upward
B. downward
C. forward
D. backward
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______ thunderstorms generally form in a warm, moist airmass and are associated with or scattered over a large area.
A. frontal
B. convection
C. airmass
D. cumulus
Airmass thunderstorms are most common during ________ .
A. hot summer afternoon
B. cold winter afternoon
C. warm spring afternoon
D. cool autumn afternoon
_______ thunderstorms can occur in late spring and summer during the late night or early morning.
Airmass
B. Frontal
C. Nocturnal
Daytime
Which one is not a hazard produced by thunderstorm?
A. lightning
B. turbulence
C. tornado
D. CAT