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Question 164-1 : When fog is reported, the visibility is below ? [ Formation assignment ]
1 km.
.mist is defined as visibility between 1 and 5 kilometers..below 1 km, we talk about fog.
Question 164-2 : When visibility is reduced by water droplets to less than 1000 metres it is classified as ?
Fog.
.mist is defined as visibility between 1 and 5 kilometers..below 1 km, we talk about fog.
Question 164-3 : Which cloud type may indicate the presence of severe turbulence ?
Altocumulus lenticularis
Question 164-4 : Which is true of advection fog ?
It can appear suddenly by day or by night.
.advection fog forms when warm humid air flows over a cold surface, so it can appear suddenly by day or by night, when a warm front is coming...radiation fog forms due to surface cooling at night in a light wind...steaming fog is the same as arctic smoke or sea smoke and is caused by cold air moving over a warm surface...advection fog forms when warm humid air flows over a cold surface...frontal fog is most likely to occur in advance of a warm front, it is due to the rain falls from the warm air into the cold air.
Question 164-5 : Which of the following sets of conditions are most likely to lead to the formation of advection fog ?
A mild moist airstream flowing over colder surfaces with the wind speed less than 15 kt.
.advection fog forms when warm humid air flows over a cold surface. as wind speed increases there is more likelihood of turbulence cloud forming...advection fog forms when warm humid air flows over a cold surface...radiation fog forms due to surface cooling at night in a light wind...steaming fog is the same as arctic smoke or sea smoke and is caused by cold air moving over a warm surface...frontal fog is most likely to occur in advance of a warm front, it is due to the rain falls from the warm air into the cold air.
Question 164-6 : Which of the following types of cloud can extend over the low, medium and high cloud levels ?
Cb.
. 503
Question 164-7 : Which of the following types of clouds are evidence of unstable air conditions ?
Cu, cb.
Question 164-8 : Which type of fog can not be formed over water ?
Radiation fog.
.radiation fog forms due to surface cooling at night in a light wind...steaming fog is the same as arctic smoke or sea smoke and is caused by cold air moving over a warm surface...advection fog forms when warm humid air flows over a cold surface...frontal fog is most likely to occur in advance of a warm front, it is due to the rain falls from the warm air into the cold air.
Question 164-9 : Stratus formed by turbulence will occur when ?
In the friction layer mixing occurs by turbulence and the condensation level is situated below the top of the turbulent layer.
.turbulence cloud is formed within the turbulence layer because mixing of the air modifies the temperature.
Question 164-10 : Radiation fog most frequently occurs in ?
High pressure systems over land.
Question 164-11 : What kind of fog is often observed in the coastal region of newfoundland in spring time ?
Advection fog.
.advection of warm air over a cold surface => the air will cool by bellow ==> advection fog..indication = coastal region...warm and moist air from the sea is traveling over the cold surface of the coast => advection fog.
Question 164-12 : Which statement is correct ?
Fog can be supercooled and can also contain ice crystals.
Question 164-13 : The cloud type most applicable to square 3c is. 355 ?
Ns.
. 559
Question 164-14 : The cloud type most applicable to square 2d is. 356 ?
As.
.square 2d 7000 ft to 18000 ft. 622.the most applicable cloud type are ns and as.
Question 164-15 : The cloud most likely to be experienced in square 1e is. 357 ?
Ci.
.the magic drawing. 622.we can exclude ac and as above 18000 ft. cb will be met after a cold front.
Question 164-16 : If radiation fog forms on a clear night with light winds, the increase in wind speed from 5 kt to 13 kt will most likely ?
Cause the fog to lift and become low stratus.
Question 164-17 : Clouds will mainly consist of supercooled water droplets when the temperature is ?
Between 0°c and 15°c.
Question 164-18 : Frontal fog can be formed by ?
Condensation of air saturated by evaporation of precipitation.
Question 164-19 : Advection of very cold air over a warm sea current can cause ?
Steaming fog.
.steaming fog is the same as arctic smoke or sea smoke and is caused by cold air moving over a warm surface...radiation fog forms due to surface cooling at night in a light wind...advection fog forms when warm humid air flows over a cold surface...frontal fog is most likely to occur in advance of a warm front, it is due to the rain falls from the warm air into the cold air.
Question 164-20 : As a result of diurnal variation radiation fog is lifted and a cloud cover is formed. which statement is true ?
Low stratus will develop caused by increasing wind speed.
.radiation fog occurs over land most commonly inland on clear, moist nights when the wind speed is less than about 5 kt. it forms after sunset as the wet ground begins to cool, producing condensation in the nearby air..morning solar radiation heats the ground, this generates increasing wind above the radiation fog entrains drier air and accelerates the dissipation...note in summer, radiation fog layers are most often thin due to short nights. in the winter, however, under stationary synoptic situations radiation fog can last for days.
Question 164-21 : In which situation is advection fog most likely to form ?
An air mass moving inland from the coast in winter.
.this mass of air is relatively warm and full of moisture will be cooled by bellow by contact with the inland cold ground. condensation will occur and advection fog will be created.
Question 164-22 : About ten identical clouds are in the sky, well isolated from one another, dense, with well defined contours, developping vertically in a cauliflower shape. the side of these clouds lit by the sun is bright white. their base, relatively dark, is essentially horizontal and at fl 30, and their tops at ?
Towering cumulus.
Question 164-23 : Which of the following cloud types is classified as low level cloud ?
Sc.
Cqb15 july 2011...sc stratocumulus low level.cs cirrostratus high level.as altostratus medium level.ac altocumulus medium level.
Question 164-24 : Which of the following cloud types is found at high level ?
Cs.
Cqb15 july 2011...cs cirrostratus high level.sc stratocumulus low level.st stratus low level.ac altocumulus medium level... 503..
Question 164-25 : Which one of the displayed cloud forms is representative of a cumulus.. 375 ?
1.
Cqb15 august 2011.
Question 164-26 : Which one of the following cloud types can be characterised by the optical phenomenon called halo ?
Cirrostratus.
. 635.they are produced by the ice crystals in cirrus clouds high. the particular shape and orientation of the crystals is responsible for the type of halo observed. light is reflected and refracted by the ice crystals and may split up into colors because of dispersion. the crystals behave like prisms and mirrors, refracting and reflecting sunlight between their faces, sending shafts of light in particular directions.
Question 164-27 : Which cloud type genus is described by the following definition.'greyish or bluish cloud sheet or layer of striated, fibrous or uniform appearance, totally or partly covering the sky, and having parts thin enough to reveal the sun at least vaguely, as through ground glass. this genus does not show ?
Altostratus.
. cirrus ci detached clouds in the form of white, dedicate filaments or white or mostly white patches or narrow bands. these clouds have fibrous hair like appearance, or a silky sheen, or both... cirrocumulus cc thin, white patch, sheet or layer of cloud without shading, composed of very small elements in the form of grains, ripples, etc., merged or separate, and more or less regularly arranged, most of the elements have an apparent width of less than one degree... cirrostratus cs transparent, whitish cloud veil of fibrous hair like or smooth appearance, totally or partly covering the sky, and generally producing halo phenomena... altostratus as greyish or bluish cloud sheet or layer of striated, fibrous or uniform appearance, totally or partly covering the sky, and having parts thin enough to reveal the sun at least vaguely, as through ground glass. altostratus cloud does not show halo phenomena... altocumulus ac white or grey, or both white and grey, patch, sheet or layer of cloud, generally with shading, composed of laminae, rounded masses, rolls, etc., which are sometimes partly fibrous or diffuse and which may or may not be merged, most of the regularly arranged small elements usually have an apparent width of between one and five degrees... nimbostratus ns grey cloud layer, often dark, the appearance of which is rendered diffuse by more or less continuously falling rain or snow, which in most cases reaches the ground. it is thick enough throughout to blot out the sun... stratocumulus sc grey or whitish, or both grey and whitish, patch, sheet or layer of cloud which almost always has dark parts, composed of tessellations, rounded masses, rolls, etc., which are non fibrous except for virga and which may or may not be merged, most of the regularly arranged small elements have an apparent width of more than five degrees... stratus st generally grey cloud layer with a fairly uniform base, which may give drizzle, ice prisms or snow grains. when the sun is visible through the cloud, its outline is clearly discernible. stratus does not produce halo phenomena except, possible, at very low temperatures... cumulus cu detached clouds, generally dense and with sharp outlines, developing vertically in the form of rising mounds, domes or towers, of which the bulging upper parts often resembles a cauliflower. the sunlit parts of these clouds are mostly brilliant white, their base is relatively dark and nearly horizontal... cumulonimbus cb heavy and dense cloud, with a considerable vertical extent, in the form of a mountain or huge towers. at least part of its upper portion is usually smooth, or fibrous or striated, and nearly always flattened, this part often spreads out in the shape of an anvil or vast plume. under the base of this cloud which is often very dark, there are frequently low ragged clouds ether merged with it or not, and precipitation sometimes in the form of virga...alto means height or upper air, in meteorological context = medium level...cirro, from which cirrus is obtained means 'wisp of hair'...cumulo, from which cumulus is obtained means 'heap'. clouds with this designator appear to be piled up. these type clouds form in unstable layers of air. the initial lifting may be due to convective lifting or forced mechanical lifting, such as, orographic, frontal or convergence lifting. if the layer is unstable, the air parcel will continue to rise producing a cumulo form cloud...nimbo means 'rain'. thus, nimbostratus and cumulonimbus are clouds from which precipitation occurs...strato, from which stratus is obtained means 'layer' or 'layered'. clouds with this designator form in stable layers of air, except the stratocumulus type which forms in a thin, unstable layer of air.
Question 164-28 : What cloud type can produce freezing rain ?
Nimbostratus.
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Question 164-29 : Frontal fog is most likely to dissipate ?
After the passage of a warm front.
.the question asks for 'dissipation' of the frontal fog... not how it occurs..frontal fog is likely to occur in advance of a warm front, due to rain falls from warm air to cold air..frontal fog is most likely to dissipate after the passage of a warm front.
Question 164-30 : Which of the following situations will most likely lead to a stable air mass ?
Subsidence and/or cooling from below.
Question 164-31 : Which cloud species is described by the following definition 'clouds which present, in at least some portion of their upper part, cumuliform protuberances in the form of turrets which generally give the clouds a crenellated appearance. the turrets, some of which are taller than they are wide, are ?
Castellanus.
Question 164-32 : Which of the following processes contributes to the formation of frontal fog ?
Rain falls from the warm air into the cold air.
Question 164-33 : Which cloud species is described by the following definition.'cumulonimbus characterised by the presence, mostly in its upper portion, of distinct cirriform parts of clearly fibrous or striated structure, frequently having the form of an anvil, a plume or a vast, more or less disorderly mass of ?
Capillatus.
As the cumulonimbus cloud grows in size, it may turn into a cumulonimbus capillatus, which means that it gains a fibrous edged top. 640.a clearly developed cumulonimbus capillatus displaying the classic anvil shape.
Question 164-34 : Which of the following statements is true concerning orographic fog ?
It may be formed by day as well as by night.
The most likely conditions which contribute to the formation of orographic fog hill fog are humid stable air mass and wind blowing towards the hills. orographic fog may be formed by day as well as by night.
Question 164-35 : Which cloud type genus is described by the following definition.'detached clouds in the form of white, delicate filaments or white or mostly white patches or narrow bands. these clouds have fibrous hair like appearance, or a silky sheen, or both'. ?
Cirrus.
. 642. cirrus cloud
Question 164-36 : The main components of a cirrostratus are ?
Ice crystals.
Question 164-37 : Which of the following circumstances most favours the development of orographic fog ?
High relative humidity.
Ecqb01 2013...the most likely conditions which contribute to the formation of orographic fog hill fog are humid stable air mass and wind blowing towards the hills. orographic fog may be formed by day as well as by night.
Question 164-38 : The main components of an altostratus are ?
Ice crystals and water droplets.
Ecqb01 2013
Question 164-39 : Which of the following cloud types is found at high level ?
Cc
Ecqb01 2013...cc cirrocumulus high level.sc stratocumulus low level.st stratus low level.ac altocumulus medium level... 503..
Question 164-40 : In wintertime stratus is often formed when warm maritime air moves over cold land. how can such clouds be classified ?
Turbulence clouds.
Kschepers .why thanks in advance for your answer...these clouds are classified as 'turbulence cloud' because they are formed by the action of atmospheric turbulence. they are not formed by orographic, frontal or convective lifting. these clouds are usually formed in a distinctive layer above the condensation level, which is about 1000 ft thick in otherwise stable atmosphere.
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