Weather

Front 1

What is indicated if ice pellets are encountered at 8,000 feet?

Back 1

freezing rain at higher altitude

Front 2

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

Back 2

dissipating

Front 3

A moist, unstable air mass is characterized by

Back 3

cumuliform clouds and showery precipitation

Front 4

If a temperature inversion is encountered immediately after takeoff or during an approach to a landing, a potential hazard exists due to

Back 4

wind shear

Front 5

Which statement is true concerning squall lines?

Back 5

they offer the most intense weather hazards to aircraft

Front 6

With regard to windflow patterns shown on surface analysis charts; when the isobars are

Back 6

close together, the pressure gradient force is greater and wind velocities are stronger

Front 7

What lifts advection fog into low stratus clouds?

Back 7

surface winds of approximately 15 knots or stronger

Front 8

In what ways do advection fog, radiation fog, and steam fog differ in their formation or location?

Back 8

radiation fog is restricted to land areas; advection fog is most common along coastal areas; steam fog forms over a water surface.

Front 9

Moisture is added to air by

Back 9

evaporation and sublimation

Front 10

Which would decrease the stability of an air mass?

Back 10

warming from below

Front 11

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

Back 11

the start of rain.

Front 12

What type weather can one expect from moist, unstable air, and very warm surface temperatures?

Back 12

strong updrafts and cumulonibus clouds

Front 13

The general circulation of air associated with a high-pressure area in the Northern Hemisphere is

Back 13

outward, downward, and clockwise

Front 14

Which would increase the stability of an air mass?

Back 14

cooling from below

Front 15

Which is a characteristic of stable air?

Back 15

restricted visibility

Front 16

One of the most dangerous features of mountain waves is the turbulent areas in and

Back 16

below rotor clouds.

Front 17

The most severe weather conditions, such as destructive winds, heavy hail, and tornadoes, are generally associated with

Back 17

squall lines

Front 18

If airborne radar is indicating an extremely intense thunderstorm echo, this thunderstorm should be avoided by a distance of at least

Back 18

20 miles

Front 19

Ice pellets encountered during flight normally are evidence that

Back 19

a warm front is about to pass.

Front 20

Which is true regarding the use of airborne weather-avoidance radar for the recognition of certain weather conditions?

Back 20

the avoidance provides no assurance of avoiding instrument weather conditions.

Front 21

The jet stream and associated clear air turbulence can sometimes be visually identified in flight by

Back 21

long streaks of cirrus clouds

Front 22

Which cloud types would indicate convective turbulence?

Back 22

towering cumulus clouds

Front 23

What determines the structure or type of clouds which will form as a result of air being forced to ascend?

Back 23

the stabililty of the air before lifting occurs

Front 24

Hazardous wind shear is commonly encountered

Back 24

in areas of temperature inversion and near thunderstorms

Front 25

Ice pellets encountered during flight are normally evidence that

Back 25

freezing rain exists at higher altitude.

Front 26

Select the true statement pertaining to the life cycle of a thunderstorm.

Back 26

the beginning of rain at the Earth's surface indicates the mature stage of the thinderstorm.

Front 27

If clouds form as a result of very stable, moist air being forced to ascend a mountain slope, the clouds will be

Back 27

stratus types with little vertical development and little or no turbulence.

Front 28

Which in-flight hazard is most commonly associated with warm fronts?

Back 28

precipitation-induced fog.

Front 29

When conditionally unstable air with high-moisture content and very warm surface temperature is forecast, one can expect what type of weather?

Back 29

strong updrafts and cumulonimbus clouds.

Front 30

Which is a characteristic typical of a stable air mass?

Back 30

continuous precipitation

Front 31

During the winter months in the middle latitudes, the jet stream shifts toward the

Back 31

south and speed increases

Front 32

GIVEN:
Winds at 3,000 feet AGL 30 kts
Surface winds Calm
While on approach for landing under clear skies with convective turbulence a few hours after sunrise, one should

Back 32

increase approach airspeed slightly above normal to avoid stalling.

Front 33

Frost covering the upper surface of an airplane wing usually will cause

Back 33

the airplane to stall at an angle of attack that is lower than normal

Front 34

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

Back 34

stable, moist air

Front 35

The low-level wind shear Alert System (LLWAS) provides wind data and software process to detect the presence of a

Back 35

change in wind direction and /or speed within a very short distance above the airport.

Front 36

From which measurement of the atmosphere can stability be determined?

Back 36

the ambient lapse rate

Front 37

Of the following, which is accurate regarding turbulence associated with thunderstorms?

Back 37

outside the cloud, shear turbulance can be encountered 20 miles laterally from a severe storm.

Front 38

Which is true with respect to a high- or low-pressure system?

Back 38

a high-pressure area or ridge is area of descending air.

Front 39

What is a characteristic of stable air?

Back 39

stratiform clouds

Front 40

A situation most conducive to the formation of advection fog is

Back 40

an air mass moving inland from the coastline during the winter.

Front 41

Advection fog has drifted over a coastal airport during the day. What may tend to dissipate or lift this fog into low stratus clouds?

Back 41

wind 15 knots or stronger

Front 42

Every physical process of weather is accompanied by or is the result of

Back 42

a heat exchange.

Front 43

With respect to advection fog, which statement is true?

Back 43

it can appear suddendly during day or night, and it is more persistant than radiation fog.

Front 44

Which is true regarding high- or low-pressure systems?

Back 44

a low-pressure area trough is an area of rising air.

Front 45

During an IFR cross-country flight you picked up rime icing which you estimate is 1/2" thick on the leading edge of the wings. You are now below the clouds at 2000 feet AGL and are approaching your destination airport under VFR. Visibility under the clouds is more than 10 miles, winds at the destination airport are 8 knots right down the runway, and the surface temperature is 3 degrees Celsius. You decide to

Back 45

use faster than normal approach and landing speed,

Front 46

A common location of clear air turbulence is

Back 46

in an upper trough on a polar side of a jet stream.

Front 47

Refer to the excerpt from the following METAR report:
KTUS.....08004KT 4SM HZ .....26/04 A2995 RMK RAE36
At approximately what altitude AGL should bases of convective-type cumuliform clouds be expected?

Back 47

8,800 feet

Front 48

During departure, under conditions of suspected low-level wind shear, a sudden decrease in headwind will cause

Back 48

a loss in airspeed equal to the decrease in wind velocity.

Front 49

Which type of jetstream can be expected to cause the greater turbulence?

Back 49

a curving jetstream associated with a deep low-pressure trough.

Front 50

What minimum distance should exist between intense radar echoes before any attempt is made to fly between these thunderstorms?

Back 50

40 miles,

Front 51

When flying into a low-pressure area in the Northern Hemisphere, the wind direction and velocity will be from the

Back 51

left and increasing

Front 52

Which is true regarding actual air temperature and dewpoint temperature spread? The temperature spread

Back 52

decreases as the relative humidity increases

Front 53

Which combination of weather-producing variables would likely result in cumuliform-type clouds, good visibility, and showery rain?

Back 53

unstable, moist air and no lifting mechanism.

Front 54

og produced by frontal activity is a result of saturation due to

Back 54

evaporation of precipitation

Front 55

What prevents air from flowing directly from high-pressure areas to low-pressure areas?

Back 55

coriolis force

Front 56

What causes wind?

Back 56

pressure differences

Front 57

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

Back 57

unstable, moist air

Front 58

What feature is normally associated with the cumulus stage of a thunderstorm?

Back 58

continuous updraft

Front 59

The conditions most favorable to wave formation over mountainous areas are a layer of

Back 59

stable air at mountaintop altitude and wind of at least 20 knots blowing across the ridge.

Front 60

Hail is most likely to be associated with

Back 60

cumulonimbus clouds

Front 61

Which statement is true concerning the hazards of hail?

Back 61

hailstones may be encountered in clear air several miles from a thunderstorm.

Front 62

In the Northern Hemisphere, the wind is deflected to the

Back 62

right by Coriolis force

Front 63

Which conditions are favorable for the formation of a surface based temperature inversion?

Back 63

clear, cool nights with calm or light wind

Front 64

Why does the wind have a tendency to flow parallel to the isobars above the friction level?

Back 64

coriolis force tends to counterbalance the horizontal pressure gradient

Front 65

The wind system associated with a low-pressure area in the Northern Hemisphere is

Back 65

a cyclone and is caused by Coriolis force.

Front 66

When an air mass is stable, which of these conditions are most likely to exist?

Back 66

smoke, dust, haze, etc., connected at the lower levels with resulting poor visibility.

Front 67

The presence of standing lenticular altocumulus clouds is a good indication of

Back 67

very strong turbulence.

Front 68

Low-level wind shear may occur when

Back 68

there is a low-level temperature inversion with strong winds above the inversion

Front 69

What is the approximate base of the cumulus clouds if the temperature at 2,000 feet MSL is 10°C and the dewpoint is 1°C?

Back 69

6,000 feet MSL

Front 70

When flying low over hilly terrain, ridges, or mountain ranges, the greatest potential danger from turbulent air currents will usually be encountered on the

Back 70

leeward side when flying into the wind

Front 71

What visible signs indicate extreme turbulence in thunderstorms?

Back 71

cumulonimbus clouds, very frequent lightning, and roll clouds.

Front 72

Virga is best described as

Back 72

streamers of precipitation trailing beneath clouds which evaporates before reaching the ground.

Front 73

The formation of either predominantly stratiform or predominantly cumuliform clouds is dependent upon the

Back 73

stability of the air being lifted.

Front 74

Which are characteristics of a cold air mass moving over a warm surface?

Back 74

cumuliform clouds, turbulence, and good visibility

Front 75

Which is true regarding a cold front occlusion? The air ahead of the warm front

Back 75

is warmer that the air behind the overtaking cold front.

Front 76

What is an important characteristic of wind shear?

Back 76

it can be present at any level and can exist in both a horizontaal and vertical direction.

Front 77

Which statement is true regarding squall lines?

Back 77

they are non-frontal and often contain severe, steady-state thunderstorms.

Front 78

A strong wind shear can be expected

Back 78

on the low-pressure side of a jetstream core where the speed at the core is stronger than 110 knots.

Front 79

Which feature is associated with the tropopause?

Back 79

abrupt c.hange in temperature lapse rate

Front 80

What are the characteristics of stable air?

Back 80

poor visibility,; steady precipitation; stratus clouds

Front 81

During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the

Back 81

power and vertical velocity required to remain on the proper glidepath.

Front 82

While flying cross-country, in the Northern Hemisphere, you experience a continuous left crosswind which is associated with a major wind system. This indicates that you

Back 82

are flying toward an area of generally unfavorable weather conditions.

Front 83

Convective currents are most active on warm summer afternoons when winds are

Back 83

light

Front 84

Which situation would most likely result in freezing precipitation? Rain falling from air which has a temperature of

Back 84

more that 32 degrees F into air having a temperature of 32 degrees F or less

Front 85

The strength and location of the jet stream is normally

Back 85

weaker and farther north inthe summer