Which one of the following cloud types can be characterised by the optical ? [ Revision flight ]

Question 139-1 : Cirrostratus altocumulus cumulonimbus nimbostratus

exemple 239 Cirrostratus. — Admin . 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 Cirrostratus.

Which cloud type genus is described by the following definition .'greyish or ?

Question 139-2 : Altostratus cirrostratus stratus stratocumulus

Admin . 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

What cloud type can produce freezing rain ?

Question 139-3 : Nimbostratus stratus cumulonimbus stratocumulus

exemple 247 Nimbostratus. — Img505 Nimbostratus.

Frontal fog is most likely to dissipate ?

Question 139-4 : After the passage of a warm front in advance of a warm front when the wind decreases when the wind veers

exemple 251 After the passage of a warm front. — Admin .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 After the passage of a warm front.

Which of the following situations will most likely lead to a stable air mass ?

Question 139-5 : Subsidence and/or cooling from below cold air at higher levels and advection of warm air at lower levels widespread convection decreasing wind and developing showers

exemple 255 Subsidence and/or cooling from below. — Subsidence and/or cooling from below.

Which cloud species is described by the following definition 'clouds which ?

Question 139-6 : Castellanus calvus fractus congestus

Which of the following processes contributes to the formation of frontal fog ?

Question 139-7 : Rain falls from the warm air into the cold air very cold air flows over much warmer sea moist air flows over land during a clear night maritime polar air flows over a warm ground

exemple 263 Rain falls from the warm air into the cold air. — Rain falls from the warm air into the cold air.

Which cloud species is described by the following definition .'cumulonimbus ?

Question 139-8 : Capillatus calvus fractus congestus

exemple 267 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 Capillatus.

Which of the following statements is true concerning orographic fog ?

Question 139-9 : It may be formed by day as well as by night it forms suddenly by day but not by night it is formed when the air is unstable it develops slowly and dissipates rapidly

exemple 271 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 It may be formed by day as well as by night.

Which cloud type genus is described by the following definition .'detached ?

Question 139-10 : Cirrus cirrostratus stratus altostratus

exemple 275 Cirrus. — Admin . 642. cirrus cloud Cirrus.

The main components of a cirrostratus are ?

Question 139-11 : Ice crystals ice crystals and water droplets water droplets water droplets and water vapour

exemple 279 Ice crystals. — Ice crystals.

Which of the following circumstances most favours the development of orographic ?

Question 139-12 : High relative humidity absolutely unstable air katabatic winds clear nights

exemple 283 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 High relative humidity.

The main components of an altostratus are ?

Question 139-13 : Ice crystals and water droplets water droplets and snow grains water droplets and water vapour ice crystals and ice pellets

exemple 287 Ice crystals and water droplets. — Ecqb01 2013 Ice crystals and water droplets.

Which of the following cloud types is found at high level ?

Question 139-14 : Cc st ac sc

exemple 291 Cc — Ecqb01 2013..cc cirrocumulus high level .sc stratocumulus low level .st stratus low level .ac altocumulus medium level . 503. Cc

In wintertime stratus is often formed when warm maritime air moves over cold ?

Question 139-15 : Turbulence clouds orographic clouds frontal clouds convective clouds

exemple 295 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 Turbulence clouds.

Which cloud type 'genus' is described by the following definition .'grey cloud ?

Question 139-16 : Nimbostratus altostratus stratus stratocumulus

exemple 299 Nimbostratus. — Ecqb01 june 2013 Nimbostratus.

Which cloud type 'genus' is described by the following definition .'cumulus ?

Question 139-17 : Towering cumulus cumulonimbus capillatus cumulus fractus cumulus humilis

exemple 303 Towering cumulus. — Ecqb01 june 2013 Towering cumulus.

Which of the following statements is true concerning frontal fog ?

Question 139-18 : It may be formed by day as well as by night it usually forms by night it develops rapidly and dissipates slowly it usually forms by day

exemple 307 It may be formed by day as well as by night. — Ecqb01 june 2013 It may be formed by day as well as by night.

Which of the following statements is true concerning orographic fog ?

Question 139-19 : It is formed when air is forced to rise up a slope it usually forms by night it develops when air is descending down a slope it usually forms by day

exemple 311 It is formed when air is forced to rise up a slope. — Easa 2014 ..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 It is formed when air is forced to rise up a slope.

Which of the following cloud types will most probably form when cold moist air ?

Question 139-20 : Cumulus stratocumulus nimbostratus stratus

exemple 315 Cumulus. — Easa 2014 ..over a warm surface a cold air will be heated by convection lower layer will rise and increase instability this will lead to the formation of cumulus and possible cumulonimbus with sometime severe thunderstorms Cumulus.

Which of the following clouds may extend into more than one étage ?

Question 139-21 : Cumulus congestus cirrocumulus altocumulus stratus

exemple 319 Cumulus congestus. — Admin .as strange as the easa can be french word 'étage' with its acute accent has been used at the exam instead of 'level' referring to low medium and high level clouds classification Cumulus congestus.

Which of the following circumstances most favours the development of frontal fog ?

Question 139-22 : Increase of the relative humidity by evaporation of rain drops advection of very cold air over much warmer sea nocturnal radiation absolutely unstable air

exemple 323 Increase of the relative humidity by evaporation of rain drops. — Revised ecqb03 august 2016 ..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 .frontal fog can be formed by condensation of air saturated by evaporation of precipitation .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 .radiation fog forms due to surface cooling at night in a light wind Increase of the relative humidity by evaporation of rain drops.

Where does one normally find the highest cloud tops ?

Question 139-23 : In a tropical cyclone in a cold front in a polar low near an occlusion point

exemple 327 In a tropical cyclone. — Ecqb03 august 2016 In a tropical cyclone.

The frontal or mixing fog results from the meeting of ?

Question 139-24 : A warm and very humid air mass with a cold and very humid air mass a warm and very dry air mass with a cold and very dry air mass a warm and very humid air mass with a cold and dry air mass a cold and very humid air mass with a cold and dry air mass

exemple 331 A warm and very humid air mass with a cold and very humid air mass. — A warm and very humid air mass with a cold and very humid air mass.

What wind conditions occurring just before dawn favour the formation of fog at ?

Question 139-25 : Calm easterly 10 kt northerly 10 kt westerly 10 kt variable

If you are flying from zurich to stockholm at fl 240 what conditions can you ?

Question 139-26 : Out of cloud throughout the flight largely free of cloud moderate icing half way along the route scattered thunderstorms cloud most of the way little chance of cat

exemple 339 Out of cloud throughout the flight. — Admin .the questions states at cruising altitude fl240 only at this level you are out of cat area out of clud top of clouds is at fl150 and there is no scattered thunderstorms Out of cloud throughout the flight.

In which cloud type does moderate to severe airframe icing most probably occur ?

Question 139-27 : In nimbostratus clouds in stratus clouds in clouds containing ice crystals in altostratus clouds

exemple 343 In nimbostratus clouds. — Admin .airframe icing will not happen in cirrus cloud composed of ice crystals or if the temperature is above 0ºc ns nimbostratus produces heavy rain if the rain falls through a cold air mass below the freezing level moderate to severe airframe icing can occur .in clear air you can only have light icing In nimbostratus clouds.

Which of the following clouds represents the most stable air mass ?

Question 139-28 : Altocumulus lenticularis altocumulus castellanus cumulus congestus cumulonimbus

exemple 347 Altocumulus lenticularis. — Altocumulus lenticularis.

A frontal depression passes through the airport what form of precipitation do ?

Question 139-29 : Continuous rain or snow during 6 hours until the warm front arrives the precipitation stops for several hours within the warm sector on the arrival of the cold front showers within a couple of hours continuous rain or snow while the frontal wave passes for a period of some 24 hours showers during some 2 hours until the warm front arrives drizzle in the warm sector within 12 hours rain or snow on the passage of the cold front rain or snow during about 12 hours until the warm front arrives within the warm sector the rain increases improvement on the passage of the cold front

exemple 351 Continuous rain or snow during 6 hours until the warm front arrives. the precipitation stops for several hours within the warm sector. on the arrival of the cold front, showers within a couple of hours. — Continuous rain or snow during 6 hours until the warm front arrives. the precipitation stops for several hours within the warm sector. on the arrival of the cold front, showers within a couple of hours.

Which of the following are favourable conditions for the formation of freezing ?

Question 139-30 : Warm air aloft from which rain is falling into air with a temperature below 0°c water droplets falling from cold air aloft with a temperature below 0°c into air with a temperature above 0°c cold air aloft from which hail is falling into air that is warm an isothermal layer aloft with a temperature just above 0°c through which rain is falling

exemple 355 Warm air aloft from which rain is falling into air with a temperature below 0°c. — Admin .freezing rain is associated with warm fronts and warm occlusions in a warm front the freezing level is lower than behind in the warm sector and the slope means that freezing rain will be falling on anything underneath so if you are flying towards a warm front or warm occlusion watch out supercooled water droplets from above will freeze onto your cold airframe once you see ice pellets expect freezing rain next . 505 Warm air aloft from which rain is falling into air with a temperature below 0°c.

Which form of precipitation from clouds containing only water is most likely to ?

Question 139-31 : Drizzle moderate rain with large drops heavy rain with large drops hail

exemple 359 Drizzle. — Admin .large waterdropplets will only form in clouds with large vertical extent and most likely also contain ice .since this cloud only contains water it is probably a normal stratus cloud the most likely answere therefore must be drizzle .answers rain with large drops refer to cumulonimbus cloud at mid latitudes in summer a cumulonimbus cloud contains ice crystals water droplets and supercooled water droplets Drizzle.

Which of the following zones is most likely to encounter little or no ?

Question 139-32 : The north side of the alps with a prevailing foehn from the south the north side of the alps with a prevailing foehn from the north frontal zones occlusions

exemple 363 The north side of the alps with a prevailing foehn from the south. — Admin .foehn winds produce precipitation on the windward side but are dry and warm on the lee ward side the lee ward side is most likely zone to encounter little or no precipitation . 502.fronts and occlusions produce plenty of precipitation The north side of the alps with a prevailing foehn from the south.

What is encountered during the summer over land in the centre of a cold air pool ?

Question 139-33 : Showers and thunderstorms strong westerly winds fine weather cu sky clear skc

exemple 367 Showers and thunderstorms. — Admin .a cold pool is a meteorologic term for a cold air block it is an area with light or no wind low temperature it is a place of instability and convective activity Showers and thunderstorms.

What type of cloud can produce hail showers ?

Question 139-34 : Cb ac ns cs

Which airport at 1200 utc has the lowest probability of precipitation . 268 ?

Question 139-35 : Lszh essa enfb efhk

Flight lisbon to bordeaux eta 1800 utc what type of precipitation is forecast ?

Question 139-36 : Heavy rain showers continuous moderate rain light drizzle and fog moderate snow showers

exemple 379 Heavy rain showers. — Heavy rain showers.

An airborne weather radar installation makes it possible to detect the location ?

Question 139-37 : Zones of precipitation particularly liquid state precipitation and also their intensity all clouds cumulonimbus but provided that cloud of this type is accompanied by falls of hail stratocumulus and its vertical development

exemple 383 Zones of precipitation, particularly liquid-state precipitation, and also their intensity — Zones of precipitation, particularly liquid-state precipitation, and also their intensity

At which altitude at temperate latitudes may hail be expected in connection ?

Question 139-38 : From the ground up to a maximum of fl 450 from the ground up to about fl 200 from the ground up to about fl 100 from the base of the clouds up to about fl 200

exemple 387 From the ground up to a maximum of fl 450. — From the ground up to a maximum of fl 450.

With which of the following types of cloud is '+ra' precipitation most commonly ?

Question 139-39 : Ns ac sc st

With what type of cloud is 'gr' precipitation most commonly associated ?

Question 139-40 : Cb st cc as

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