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weather theory section 4 Flashcards

(75 cards)

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1
Q

what caused variations in altimeter settings between wether reporting points

A

unequal heating of the earths surface

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2
Q

a nonfrontal narrow band of active thunderstorms that often develop ahead of a cold is known as a

A

squall line

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3
Q

what feature is normally associated with the cumulus stage of a thunderstorm

A

continuous updraft

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4
Q

convection circulation patterns associated with sea breezes are caused by

A

cool, dense air moving inland from over the water

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5
Q

if there is a thunderstorm activity in the vicinity of an airport at which the pilot plans to land. which hazardous atmospheric phenomenon might be expected on the landing approach

A

wind shear turbulence

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6
Q

during the life cycle of a thunderstorm which stage is characteristic predominately by downdrafts

A

dissipating

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7
Q

every physical process is weather is accompanied by or is the result of a

A

heat exchange

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8
Q

what conditions are necessary for the formation of thunderstorms

A

high humidity lifting force and unstable conditions

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9
Q

the development of thermals depends upon

A

solar heating

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10
Q

one weather phenomenon which will always occur when flying across a front is change in the

A

wind direction

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11
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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12
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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13
Q

one weather phenomenon which will always occur when flying across a front is a change in the

A

wind direction

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14
Q

a nonfrontal narrow band of active thunderstorms that often develop ahead of a cold front is known as a

A

squall line

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15
Q

the presence of ice pellets at the surface is evidence that there

A

is a temp inversion with freezing rain at a high altitude

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16
Q

an almond or lens shaped cloud which appears stationary but which may contain winds of 50 knots or more is referred to as

A

a lenticular cloud

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17
Q

where does wind shear occur

A

at all altitude in all directions

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18
Q

where are the processes by which moisture is added to unsaturated air

A

evaporation and sublimation

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19
Q

in which station is advection fog most likely to form

A

an air mass moving inland from the coast in winter

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20
Q

what cloud types would indicate convective turbulence

A

towering cumulus cloud

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21
Q

what is the approximate base of the cumulus cloud if the surface air temperature at 1000 ft MSL and the dew point is 48

A

6000 ft MSL
cloud base = temp - dew point / 4.4 x 1000 + 1000 on what we already have

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22
Q

if an unstable air mass is moved upward what type of clouds can be expected

A

clouds with considerable vertical development and associated turbulence

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23
Q

what measurement can be used to determine the stability of the atmosphere

A

actual lapse rate
(equivalent to determining if we have a stable or unstable airmass)

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24
Q

which weather conditions should be expected beneath a low level temp inversion layer when the relative humidity is high

A

smooth air poor vis fog haze. of clouds

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25
the development of thermals depends upon
solar heating
26
one weather phenomenon which will always occur when flying across a front is a change in the
wind direction
27
two boundary between two different air masses is referred to as a
front
28
one of the most easily recognized discontinuities across a front is
change in temp
29
the wind at 5000 ft AGL is southwesterly while the surface wind is southerly this difference lorene in direction is primarily due to
friction between the wind and the surface
30
thunderstorms reach their greatest intensity during the
mature stage
31
where does wind shear occur
at all altitudes in all directions
32
the destination airport has one runway 8-26 and the wind is calm the normal approach in calm wind is a left hand pattern to runway 8 there is no other traffic at the airport A thunderstorm about 6 miles west is beginning its mature stage and rain is starting to reach the ground the pilot decides to
fly an approach to runaway 26 since any unexpected wind due to the storm will be westerly
33
an almond or lens shaped cloud which appears stationary but which may contain winds of 50kts or more is referred to as
a lenticular cloud
34
in which environment is aircraft structural ice most likely to have the highest accumulation rate
freezing rain
35
thunderstorms which generally produce the most intense hazard to aircraft are
squall line thunderstorms
36
possible mountain wave turbulence could be anticipated when winds of 40 mrs or greater blow
across a mountain ridge and the air is stable
37
the mature stage of a thunderstorm begins with
the start of precipitation
38
the presence of ice pellets at the surface is evidence that there
is a temp inversion with freezing rain at a high altitude
39
one in flight condition necessary for structural icing to form is
visible moisture
40
when may hazardous wind shear be expected
in areas of low level temp inversion frontal zones and clear air turbulence
41
which weather phenomenon is always associated with a thunderstorm
lightning
42
a pilot can expect a wind shear zone in a temp inversion whenever the wind speed at 2000 to 4000 ft above the surface is at least
25kts
43
one in flight condition necessary for structural icing to form is
visible moisture
44
when may hazardous wind shear be expected
in areas of low level temp inversion frontal zone and clear air turbulence
45
creates of standing mountain waves may be marked by stationary lens shaped clouds known as
standing lenticular clouds
46
if the temp of dew point is spread is small and decreasing and the temp is 62 degrees f what type weather is most likely to develop
fog or low clouds
47
which weather phenomenon signals the beginning of the mature stage of a thunderstorm
precipitation beginning to fall
48
clouds are divided into four families according to their
height range
49
the amount of water vapor which air can hold depends on the
air temp
50
clouds, fog, or dew will always form when
water vapor condenses
51
which conditions result in the formation of frost
the temp of the collecting surface is at or below the dew point of the adjacent air and the dew point is below freezing
52
what types of fog depend upon wind in order to exist
advection fog and upslope fog
53
what clouds have greatest turbulence
cumulonimbus
54
what are the processes by which moisture is added unsaturated air
evaporation and sublimation
55
the conditions necessary for the formation of cumulonimbus clouds are a lifting action and
unstable moist air
56
what situation is most conducive to the formation of radiation fog
warm moist air over low flatland areas on clear calm nights
57
low level turbulence can occur and icing can become hazardous in which type of fog
steam fog
58
what cloud types would indicate connective turbulence
towering cumulus clouds
59
in which situation is advection fog most likely to form
an air mass moving inland from the coast in winter
60
what is meant by the term dew point
the temp to which air must be cooled to become saturated
61
the suffix nimbus used in naming clouds means
a rain cloud
62
what are the characteristics of a moist unstable air mass
cumuliform clouds and showery precipitation
63
if an unstable air mass is forced upward what type clouds can be expected
clouds with considerable vertical development and associated turbulence
64
at approximately what altitude the surface would the pilot expect the base of cumuliform clouds if the surface air temp is 82 degrees f and the dew point is 38 degrees f
10,000 ft AGL
65
which weather conditions should be expected beneath a low level temp inversion layer when the relative humidity is high
smooth air poor vis fog haz and low clouds
66
what would decrease the stability of an air mass
warning from below
67
what measurement can be used to determine the stability of the atmosphere
actual lapse rate
68
the most frequent type of ground surface based temp inversion is that which produced by
terrestrial radiation on a clear relatively still night
69
what are characteristics of unstable air
turbulence and good surface stability
70
what is a characteristic of stable air
stratiform clouds
71
what features is associated with temp inversion
a stable layer of air
72
when warm moist stable air flows upslope it
produces stratus type clouds
73
steady precipitation preceding a font is an indication of
stratified clouds with little or no turbulence
74
when there is a temp inversion the pilot would expect to experience
an increase in temp as altitude increases
75
a stable air mass is most likely to have which characteristic
poor surface vis

weather theory (4 decks)

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