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Revision > flight : Which of the following situations will most likely lead to a stable air mass ?

Question 137-1 : 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 237 subsidence and/or cooling from below.subsidence and/or cooling from below.

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

Question 137-2 : Castellanus calvus fractus congestus

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

Question 137-3 : 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 245 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 137-4 : Capillatus calvus fractus congestus

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

Which of the following statements is true concerning orographic fog ?

Question 137-5 : 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

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 exemple 253 it 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 137-6 : Cirrus cirrostratus stratus altostratus

. 642. cirrus cloud exemple 257 cirrus.cirrus.

The main components of a cirrostratus are ?

Question 137-7 : Ice crystals ice crystals and water droplets water droplets water droplets and water vapour

exemple 261 ice crystals.ice crystals.

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

Question 137-8 : High relative humidity absolutely unstable air katabatic winds clear nights

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 exemple 265 high relative humidity.high relative humidity.

The main components of an altostratus are ?

Question 137-9 : Ice crystals and water droplets water droplets and snow grains water droplets and water vapour ice crystals and ice pellets

Ecqb01 2013 exemple 269 ice crystals and water droplets.ice crystals and water droplets.

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

Question 137-10 : Cc st ac sc

Ecqb01 2013...cc cirrocumulus high level .sc stratocumulus low level .st stratus low level .ac altocumulus medium level. 503. exemple 273 cccc

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

Question 137-11 : Turbulence clouds orographic clouds frontal clouds convective 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 exemple 277 turbulence clouds.turbulence clouds.

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

Question 137-12 : Nimbostratus altostratus stratus stratocumulus

Ecqb01 june 2013 exemple 281 nimbostratus.nimbostratus.

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

Question 137-13 : Towering cumulus cumulonimbus capillatus cumulus fractus cumulus humilis

Ecqb01 june 2013 exemple 285 towering cumulus.towering cumulus.

Which of the following statements is true concerning frontal fog ?

Question 137-14 : 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

Ecqb01 june 2013 exemple 289 it may be formed by day as well as by night.it may be formed by day as well as by night.

Which of the following statements is true concerning orographic fog ?

Question 137-15 : 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

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 exemple 293 it is formed when air is forced to rise up a slope.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 137-16 : Cumulus stratocumulus nimbostratus stratus

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 exemple 297 cumulus.cumulus.

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

Question 137-17 : Cumulus congestus cirrocumulus altocumulus stratus

.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 exemple 301 cumulus congestus.cumulus congestus.

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

Question 137-18 : Increase of the relative humidity by evaporation of rain drops advection of very cold air over much warmer sea nocturnal radiation absolutely unstable air

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 exemple 305 increase of the relative humidity by evaporation of rain drops.increase of the relative humidity by evaporation of rain drops.

Where does one normally find the highest cloud tops ?

Question 137-19 : In a tropical cyclone in a cold front in a polar low near an occlusion point

Ecqb03 august 2016 exemple 309 in a tropical cyclone.in a tropical cyclone.

The frontal or mixing fog results from the meeting of ?

Question 137-20 : 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 313 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 137-21 : Calm easterly 10 kt northerly 10 kt westerly 10 kt variable

exemple 317 calm.calm.

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

Question 137-22 : 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

.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 exemple 321 out of cloud throughout the flight.out of cloud throughout the flight.

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

Question 137-23 : In nimbostratus clouds in stratus clouds in clouds containing ice crystals in altostratus clouds

.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 exemple 325 in nimbostratus clouds.in nimbostratus clouds.

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

Question 137-24 : Altocumulus lenticularis altocumulus castellanus cumulus congestus cumulonimbus

exemple 329 altocumulus lenticularis.altocumulus lenticularis.

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

Question 137-25 : 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 333 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 137-26 : 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

.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 exemple 337 warm air aloft from which rain is falling into air with a temperature below 0°c.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 137-27 : Drizzle moderate rain with large drops heavy rain with large drops hail

.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 exemple 341 drizzle.drizzle.

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

Question 137-28 : 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

.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 exemple 345 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 south.

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

Question 137-29 : Showers and thunderstorms strong westerly winds fine weather cu sky clear skc

.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 exemple 349 showers and thunderstorms.showers and thunderstorms.

What type of cloud can produce hail showers ?

Question 137-30 : Cb ac ns cs

exemple 353 cb.cb.

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

Question 137-31 : Lszh essa enfb efhk

exemple 357 lszhlszh

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

Question 137-32 : Heavy rain showers continuous moderate rain light drizzle and fog moderate snow showers

exemple 361 heavy rain showers.heavy rain showers.

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

Question 137-33 : 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 365 zones of precipitation, particularly liquid-state precipitation, and also their intensityzones of precipitation, particularly liquid-state precipitation, and also their intensity

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

Question 137-34 : 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 369 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 137-35 : Ns ac sc st

exemple 373 ns.ns.

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

Question 137-36 : Cb st cc as

exemple 377 cb.cb.

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

Question 137-37 : St cb cc cu

.drizzle is a slowly falling precipitation in the form of tiny water droplets with diameters less than 0 5 millimeters it falls from stratus clouds and is often associated with low visibility and fog stratus does not usually produce precipitation but when it does occur it is in the form of minute particles such as drizzle ice crystals or snow grains exemple 381 st.st.

Which of the following cloud types is least likely to produce precipitation ?

Question 137-38 : Ci cb as ns

exemple 385 ci.ci.

With what type of cloud is heavy precipitation unlikely during the summer months ?

Question 137-39 : Sc as cb st ns cc as ns

.cb cumulonimbus and ns nimbostratus produce heavy rain .the only possible answer is sc as stratocumulus and altostratus .with sc and as you will get light rains exemple 389 sc, as.sc, as.

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

Question 137-40 : Cb as sc ns

exemple 393 cb.cb.

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