Thunderstorms: DGCA Aviation Meteorology questions

Question 1

The conditions which must exist to allow thunderstorms to develop are:

Accepted Answer

a plentiful supply of moisture and a steep lapse rate through a large vertical extent and a trigger action

Answer

a trigger action, a plentiful supply of moisture and a very stable atmosphere

Answer

a steep lapse rate, a stable atmosphere through a large vertical extent and a plentiful supply of moisture

Answer

a steep lapse rate through a large vertical extent, a low relative humidity and a trigger action

Question 2

When moist air moves across France in the . . . . . . . . . . TS activity is common in southern UK in the . . . . . . . . . .
Complete the above statement correctly using one of the following:

Accepted Answer

summer/late afternoon or evening

Answer

winter/morning

Answer

winter/late afternoon or evening

Answer

summer/morning

Question 3

Hazards of the mature stage of a TS cell include lightning, turbulence and:

Accepted Answer

icing, microburst and windshear

Answer

microburst, windshear and anvil

Answer

icing, drizzle and microburst

Answer

windshear, hail and fog

Question 4

On a significant weather chart the thunderstorm symbol signifies:

Accepted Answer

moderate/severe turbulence and/or moderate/severe icing

Answer

moderate turbulence and moderate icing

Answer

severe turbulence and severe icing

Answer

moderate turbulence and severe icing

Question 5

Thunderstorms require a trigger action to release the conditional instability. Which of the following would be the least suitable as a trigger?

Accepted Answer

Subsidence in tropical latitudes

Answer

Convergence in temperate latitudes

Answer

Convergence in tropical latitudes

Answer

Convection in polar latitudes

Thunderstorms: DGCA Aviation Meteorology questions

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