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Weather > Aviation Weather > Flashcards

Aviation Weather Flashcards

1
Q

What causes variations in altimeter settings between weather reporting points?

A

Unequal heating of the Earth’s surface

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2
Q

The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to

A

friction between the wind and the surface

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3
Q

Convective circulation patterns associated with sea breezes are caused by

A

cool, dense air moving inland from over the water

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4
Q

The development of thermals depends upon

A

solar heating

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5
Q

The boundary between two different air masses is referred to as

A

font

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6
Q

One weather phenomenon which will always occur when flying accros a front is a change in teh

A

wind direction

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7
Q

One of the most easily recognized discontinuities across a front is

A

a change in temperture

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8
Q

If there is thunderstorm activity in the vicinity of an airport at which you plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach?

A

Wind shear turbelance

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9
Q

A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is know as a

A

squall line

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10
Q

what conditions are necessary for the formation of thunderstorms?

A

High humidity, lifting force, and unstable conditions

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11
Q

During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts>

A

Dissipating

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12
Q

Thunderstarms reach their greates intensity during

A

mature stage

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13
Q

What feature is normally associated witht eh cumulus stage of a thunderstorm?

A

continuous updraft

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14
Q

Which weather phenomenon signals the beginning of teh mature stage of a thunderstorm?

A

Precipitation beginning to fall

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15
Q

Thunderstorms which generally produce the most intense hazard to aircraft are

A

squall line thunderstorms

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16
Q

Which weather phenomenon is always associated with thunderstorm?

A

Lightening

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17
Q

One inflight condition necessary for structureal icing to form is

A

visible mositure

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18
Q

In which envireonment is aircraft sturctural ice most likely to have the ightes accumulation rate?

A

Freezing rain

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19
Q

The presence of ice pellets at the surface is eveidence that there

A

is a temperture inversion with freezing rain at a higher altitude

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20
Q

An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is refered to as

A

a lenticular cloud

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21
Q

Crests of standing mountain waves may be marked by stationary, lens shaped clouds known as

A

standing lenticular clouds

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22
Q

Possible mountain wave turbulence coudl be anticipated when winds of 40 knots or greater blow

A

across a mountain ridge, and the air is stable

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23
Q

Where does wind shear occur>

A

At all altitudes in all directions

24
Q

A pilot can expect a wind shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is at least

A

25 knots

25
Q

When may hazardous wind shear be expected?

A

In areas of low level temperature inversion frontal zones and clear air turbulence

26
Q

If the temperature/dewpoint spread is smaill and decreasing, and the temperature is 62 degrees F, what type weather is most likely to develop?

A

Fog or low clouds

27
Q

What is meatn by the term “dewpoint?”

A

The temperture to which air must be cooled to become saturated

28
Q

The amount of water vapor which air can hold depends on the

A

air temperature

29
Q

What are the processes by which moisture is added to unsaturated air?

A

Evaporation and sublimation

30
Q

Which conditions result in the formation of frost?

A

The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing

31
Q

Clouds, fog, or dew will always form when

A

water vapor condenses

32
Q

Low level turbulence can occur and icing can become hazardous in wich type of fog?

A

steam fog

33
Q

In which situation is advection fog most likely to form?

A

An air mass moving inland from the coast in winter

34
Q

What situation is most conducive to the formation of radiation fog?

A

Warm, moist air over low, flatland areas on clear, calm nights

35
Q

What tupes of fog depend upon wind in order to exist?

A

Advection fog and upslope fog

36
Q

Clouds are divided into four families according to their

A

height range

37
Q

The suffix “nimbus” used in naming clouds, means

A

a rain cloud

38
Q

The conditions necessary for the formation of cumulonimbus clouds are lifting action and

A

unstable, moist air

39
Q

What clouds have the greatest turbulence?

A

Cumulonimbus

40
Q

What cloud types would indicate convective turbulence?

A

Towering cumulus clouds

41
Q

At approximately what altitude above the surface would the pilot expect teh base of cumuliform clouds if the surface air temperture is 82 degrees F and teh dewpoint is 38 degrees F?

A

10,000 feet AGL

42
Q

What is the approximate base of the cumulus clouds if the surface air temperture is at 1,000 feet MSL is 70 degrees F and teh dewpoint is 48 degrees F?

A

6,000 feet MSL

43
Q

What is a characteristic of stable air?

A

Stratiform clouds

44
Q

Moist stable air flowing upslope can be expected to

A

produce stratus type clouds

45
Q

If an unstable air mass is forced upward, what type of clouds can be expected?

A

Clouds with considerable vertical development and associated turbulence

46
Q

What are characteristics of unstable air?

A

Turbulence and good surface visibility

47
Q

A stable air mass is most likely to have whihc characteristic?

A

Poor surface visibility

48
Q

Steady precipitation preceding a front in an indicatin of

A

stratiform clouds with little or no turbulence

49
Q

What are characteristics of a moist unstable air mass?

A

Cumuliform clouds and showery precipitation

50
Q

What measurement can be used to determine the stability of the atmosphere?

A

Actual lapse rate

51
Q

What would decrease the stability of an air mass?

A

Warming from below

52
Q

What feature is associated with a temperature inversion

A

A stable layer of air

53
Q

The most frequent type of ground or surface based tempertaure inversion is that which is produced by

A

terrestrial radiation on a clear, relatively still night

54
Q

A temperature inversion would most liekly result in which weather condition?

A

An increased in temperature as altitude is increased

55
Q

Which weather condtions shuld be expected beneath a low level temperature inversion layer when the relative humidy is high?

A

Smooth air, poor visibility, fogm haze, or low clouds

Weather (19 decks)

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