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Navedtra 14342a > Aviation Weather > Flashcards

Aviation Weather Flashcards

1
Q

All weather occurs in what layer

A

Troposphere

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2
Q

Atmospheric pressure is measured using either an aneroid barometer or an_____________ barometer

A

Mercurial

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3
Q

What are two basic units used to measure and report atmospheric pressure

A

Inches of mercury and millibars

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4
Q

When an aircraft flying below 18,000 ft flies from high pressure area Into a low pressure area and the altimeter is not corrected , the altimeter reading will be …

A

To high

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5
Q

An aircraft is flying above 18,000 ft what should the altimeter be ?

A

The standard atmospheric pressure

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6
Q

When an aircraft flying below 18,000 feet flies from a low temperature area into a high temperature area and the altimeter is not corrected the reading will be ?

A

Too low

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7
Q

What type of cloud appears as white wisps against they sky

A

Cirrus

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8
Q

What type of cloud appears as a smooth , thin layered cloud covering all or most of the sky , giving the sky a milky appearance

A

Cirrostratus

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9
Q

What type of cloud appears as thick grey or blue grey overcast

A

Alto stratus

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10
Q

What type of cloud resembles maintains or towers

A

Cumulonimbus

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11
Q

A front /whose motion is such that cold air displaces warm air at the surface is called an

A

Cold front

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12
Q

A front that has little to no motions is called

A

Stationary front

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13
Q

What is the difference in temperature and Dew point

A

Dew point depression

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14
Q

Which type of fog is the most common problem for air traffic control

A

Radiation fog

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15
Q

Which is considered the most serious of the fours types of airframe ice

A

Clear

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16
Q

Which type of airframe ice forms as each super cooled water droplet that strikes the airfoil freezes completely before another droplet strikes in the same place

A

Rime

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17
Q

Which type of turbulence occurred because of surface heating

A

Thermal

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18
Q

Which type of turbulence is caused by a severe change in either wind speed or wind direction

A

Low level wind shear

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19
Q

Which of the following terms is frequently used by pilots to report turbulence characterized by rhythmic bumpiness with little attitude change

A

Light or moderate chop

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20
Q

How often are speci weather observations issued

A

When a significant change in the weather occurs between the top of the hour and 44 mins past the hour

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21
Q

In the sky condition weather group of a weather observation sky cover 2/8s would be classified as which of the following

A

Few

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22
Q

Which of the following codes means ice on Rwy , no decelerometer reading available

A

IR //

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23
Q

What type of weather forecast is issued by the NWS for specific locations

A

TAF

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24
Q

Which military wind condition is issued when non thunderstorm winds are sustained between 18 and 33 KTS or numerous gusts equal or greater than 24 KTS are expected within 12 hours

A

High wind condition 1

25
Q

Which tropical cyclone condition is set when destructive winds are possible within 24 hours

A

Condition 2

26
Q

The atmosphere of the earth is comprised of how many basic layers

A

Five

27
Q

The mesosphere extends upward front the stratosphere to approximately

A

50 miles

28
Q

What is the standard sea level pressure of mercury in inches

A

2992

29
Q

Why is it important for an aircraft to have correct altimeter setting for the area in which it is flying

A

For safety . Altitude and vertical separation are based on these settings

30
Q

If the pressure changes by 1 inch of mercury and the aircrafts altimeter is not corrected , the altimeter error will be________ft

A

1000

31
Q

What would the altimeter read when a n aircraft flies from high temperature area into a low temperature area and the altimeter is not corrected

A

Too high

32
Q

Clouds form when the temperature of the surrounding air is between 5 degrees F and

A

32 degrees

33
Q

For a cloud to be composed almost entirely of ice crystals, the temperature of the surrounding air must be below what specific temperature

A

5F

34
Q

What type of cloud appears like fleecy flakes or small white cotton balls

A

Cirrocumulus

35
Q

What type of cloud appears similar to a herd of sheep in the sky

A

Altocumulus

36
Q

What type of cloud is thick and dark gray but formless in appearance

A

Nimbostratus

37
Q

What type of cloud has fairly poor visibility and is marked by thick rolls and dark rounded masses underneath

A

Stratocumulus

38
Q

What type of cloud appears flat shapeless and dull gray , precipitation is in the form of drizzle only

A

Stratus

39
Q

What type of cloud appears dense with vertical development

A

Cumulus

40
Q

What type of cloud is large and bag like with protuberance , like udders or punches on the undersurface

A

Cumulonimbus mammatus

41
Q

What type of cloud has the shape of a lens or almond

A

Lenticular

42
Q

A what type of cloud may extend higher than 60,000 ft and resembles an anvil

A

Cumulonimbus

43
Q

When air stagnates over certain areas , it acquires the properties from what region

A

The source region

44
Q

When two different air masses meet what weather term refers to the boundary the sow rates the masses

A

Front

45
Q

A front whose motion is such that warm air replaces cold air at the surface is called a

A

Warm front

46
Q

A complex front resulting when a surface cold front overtakes a warm front is called a

A

Occluded front

47
Q

Which of the following best defines dew point

A

The temperature at which air constant pressure and water vapor content must be cooled for saturation to occur

48
Q

Fog seldom forms when dew point spread is

A

Greater then 4 degrees

49
Q

Which type of fog is the most dangerous to aviation

A

Advection fog

50
Q

Which type of fog forms when air if forced to ascend a gradual slope

A

Upslope fog

51
Q

Which type of fog forms when cold air moves over warm water

A

Steam fog

52
Q

Heaviest airframe icing generally occurs within the temperature range of ______________ provided moisture is available

A

15 -32 degrees

53
Q

All of the following conditions produce a liquid film of water on aircraft favorable to the formation of clear ice

A

Large water droplets , large number of cloud droplets , temps above freezing

54
Q

All of the following conditions favor the formation of rime ice except

A

Very small water droplets , temperatures far below freezing

55
Q

Which type of natural turbulence is caused by lifting of warm air by moving cold fronts

A

Thermal

56
Q

Which type of natural turbulence is caused when wind flow is disturbed and transformed into irregular movements

A

Mechanical

57
Q

Turbulence that causes abrupt changes in altitude and or attitude Wouk be classified as

A

Severe

58
Q

Turbulence that causes the aircraft to be tossed about violently practically out of control would be classified as what

A

Extreme

59
Q

Turbulence that results in slight , momentary changes in altitude and or attitude would be classified as

A

Light

Navedtra 14342a (1 decks)

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