Wind, Cloud and Thunderstorm Test

通報

問題一覧

The pressure gradient force acts -

at right angles to the isobars towards the low pressure

The strength of the pressure gradient force depends most on -

The spacing of the isobars

Coriolis explains the tendency of wind to

turn left in the southern hemisphere

Surface wind, when compared to the gradient wind flow, is found to be -

Veered to the right and slower

Compared to the gradient wind flow, the surface wind over land will have -

Veered by 30 degrees and slowed by 2/3rds

The term geostrophic wind refers to the steady flow of wind -

Along straight isobars

Anti cyclonic flow occurs -

about a high in the southern hemisphere

Cyclonic flow occurs

about a low in the southern hemisphere

A katabatic wind will tend to re-inforce -

a land breeze

The variations in wind and temperature which normally occur with the passage of a cold front are

The wind backs and temperature falls

A Fohn wind is likely to result in -

a lower humidity in the less side of the mountain at low level

Select the statement which best describes a squall line -

a low cloud moving rapidly in the warm air ahead of a cold front

At which latitude would there be the greatest difference between the actual wind and gradient wind at 5000ft AGL

5 degrees S

A statement which best describes a backing wind is -

it is changing direction anti clockwise

For a katabatic wind to form, there must be -

a surface inversion

Squall lines are most often associated with -

Thunderstorms

Surface friction causes -

a decrease in Coriolis effect

An aircraft heading directly from a high pressure to a low pressure system will -

drift towards the left

Conditional stability is is said to exist when -

saturated air is unstable but dry air is stable

Which conditions are most likely to produce radiation fog -

nil cloud and light wind

During what stage of a thunderstorm would lightning be most frequent ?

at the mature stage

Where is hail most likely to be encountered inside a thunderstorm ?

between 10000 and 30000ft

In which conditions are thunderstorms most likely -

latitudinal heating of a fast moving cold moist air stream

Which of the following cloud types is most likely to produce virga -

thing altostratus

Which is most likely to be encountered in a nimbostratus cloud -

heavy continuous rain

the lifting of fog may be caused by -

an increase in wind strength

The most common way for cumulus cloud to form is

Rising air being cooled by expansion

Which phenomena in a thunderstorm causes low level windshear at some distance away from the cell -

Downdrafts

Where are tonados most likely to be encountered

with widespread sever thunderstorms

Latitudinal heating of a cold air stream produces -

Instability, possible thunderstorms

A thunderstorm can occur well after a cold front has passed because -

the surface over which the cold air is passing is warmer than the cold air masss

Advection fog forms when?

Warm air passes over a cold surface

Thunderstorms are most likely to form when atmospheric conditions are ?

Humid and unstable

A wind blowing up sloping terrain during the day could be ?

Anabatic

ATPL Systems

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