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Revision > flight : Freezing fog exists if fog droplets ?

Question 136-1 : Are supercooled are frozen are freezing very rapidly freeze when temperature falls below zero

exemple 236 are supercooled.are supercooled.

Which of the following circumstances most favour the development of radiation ?

Question 136-2 : Moist air over land during clear night with little wind warm moist air at the windward side of a mountain maritime tropical air flowing over cold sea advection of very cold air over much warmer sea

exemple 240 moist air over land during clear night with little windmoist air over land during clear night with little wind

Fallstreaks or virga are ?

Question 136-3 : Water or ice particles falling out of a cloud that evaporate before reaching the ground strong downdraughts in the polar jet stream associated with jet streaks gusts associated with a well developed bora strong katabatic winds in mountainous areas and accompanied by heavy precipitation

. 2542 exemple 244 water or ice particles falling out of a cloud that evaporate before reaching the ground.water or ice particles falling out of a cloud that evaporate before reaching the ground.

The range of wind speed in which radiation fog is most likely to form is ?

Question 136-4 : Below 5 kt between 10 and 15 kt between 5 and 10 kt above 15 kt

exemple 248 below 5 kt.below 5 kt.

At the top of orographic waves in mountainous regions the cloud most likely to ?

Question 136-5 : Altocumulus lenticularis cirrostratus cirrus cumulus mediocris

. 433. 2540 exemple 252 altocumulus lenticularis.altocumulus lenticularis.

A cumulus congestus is ?

Question 136-6 : A cumulus that is of great vertical extent a remnant of a cb a cumulus with little vertical development a cumulus that only occurs in association with the itcz

exemple 256 a cumulus that is of great vertical extent.a cumulus that is of great vertical extent.

Clouds in patches sheets or grey or whitish layers made up of elements ?

Question 136-7 : Stratocumulus stratus altostratus nimbostratus

. 597 exemple 260 stratocumulus.stratocumulus.

In mid latitudes the tops of cumulus are often limited by ?

Question 136-8 : A temperature inversion a layer of unstable air a radiation inversion the tropopause

.their growth is usually limited by a temperature inversion which is marked by the unusually uniform height of the clouds also called fair weather cumulus exemple 264 a temperature inversion.a temperature inversion.

Of what does lenticular cloud provide evidence ?

Question 136-9 : Mountain waves jet streams stratospheric inversions areas of high level clear air turbulence

exemple 268 mountain waves.mountain waves.

The formation of morning fog before sunrise is possible if ?

Question 136-10 : Air temperature and dew point are equal or close to one another the wind is strong the sky is overcast the turbulence in the lower layers is moderate

exemple 272 air temperature and dew point are equal or close to one another.air temperature and dew point are equal or close to one another.

What is the difference between radiation fog and advection fog ?

Question 136-11 : 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 radiation fog forms only on the ground advection fog only on the sea radiation fog forms due to night cooling and advection fog due to daytime cooling radiation fog is formed by surface cooling in a calm wind advection fog is formed by evaporation over the sea

.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 exemple 276 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.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.

When fog is reported the visibility is below ?

Question 136-12 : 1 km 0 8 km 1 5 km 3 km

.mist is defined as visibility between 1 and 5 kilometers .below 1 km we talk about fog exemple 280 1 km.1 km.

When visibility is reduced by water droplets to less than 1000 metres it is ?

Question 136-13 : Fog dust fog drizzle mist

.mist is defined as visibility between 1 and 5 kilometers .below 1 km we talk about fog exemple 284 fog.fog.

Which cloud type may indicate the presence of severe turbulence ?

Question 136-14 : Altocumulus lenticularis stratocumulus nimbostratus cirrocumulus

exemple 288 altocumulus lenticularisaltocumulus lenticularis

Which is true of advection fog ?

Question 136-15 : It can appear suddenly by day or by night it develops slowly and clears fast it forms when unstable air is adiabatically cooled it usually forms by night and clears by day

.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 exemple 292 it can appear suddenly by day or by night.it can appear suddenly by day or by night.

Which of the following sets of conditions are most likely to lead to the ?

Question 136-16 : A mild moist airstream flowing over colder surfaces with the wind speed less than 15 kt clear skies at night over an inland marshy area a mild moist airstream flowing over colder surfaces with a wind in excess of 30 kt cold maritime air flowing over a warmer land surface at a speed greater 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 exemple 296 a mild moist airstream flowing over colder surfaces with the wind speed less than 15 kt.a mild moist airstream flowing over colder surfaces with the wind speed less than 15 kt.

Which of the following types of cloud can extend over the low medium and high ?

Question 136-17 : Cb ac st ci

. 503 exemple 300 cb.cb.

Which of the following types of clouds are evidence of unstable air conditions ?

Question 136-18 : Cu cb st cs sc ns ci sc

exemple 304 cu, cb.cu, cb.

Which type of fog can not be formed over water ?

Question 136-19 : Radiation fog advection fog arctic smoke frontal 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 exemple 308 radiation fog.radiation fog.

Stratus formed by turbulence will occur when ?

Question 136-20 : In the friction layer mixing occurs by turbulence and the condensation level is situated below the top of the turbulent layer the wind speed is less than 10 kt and the air is heated by the earth's surface the wind speed is greater than 10 kt and the condensation level is situated just above the turbulent layer absolute instability exists at low level

.turbulence cloud is formed within the turbulence layer because mixing of the air modifies the temperature exemple 312 in the friction layer mixing occurs by turbulence and the condensation level is situated below the top of the turbulent layer.in the friction layer mixing occurs by turbulence and the condensation level is situated below the top of the turbulent layer.

Radiation fog most frequently occurs in ?

Question 136-21 : High pressure systems over land low pressure systems over sea high pressure systems over sea low pressure systems over land

exemple 316 high pressure systems over land.high pressure systems over land.

What kind of fog is often observed in the coastal region of newfoundland in ?

Question 136-22 : Advection fog frontal fog radiation fog steaming 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 exemple 320 advection fog.advection fog.

Which statement is correct ?

Question 136-23 : Fog can be supercooled and can also contain ice crystals mist and haze consist of water droplets fog and haze do not occur in the tropics mist and haze only differ by different values of visibility

exemple 324 fog can be supercooled and can also contain ice crystals.fog can be supercooled and can also contain ice crystals.

The cloud type most applicable to square 3c is . 355 ?

Question 136-24 : Ns cb ac as

. 559 exemple 328 ns.ns.

The cloud type most applicable to square 2d is . 356 ?

Question 136-25 : As cu cb cs

.square 2d 7000 ft to 18000 ft. 622.the most applicable cloud type are ns and as exemple 332 as.as.

The cloud most likely to be experienced in square 1e is . 357 ?

Question 136-26 : Ci ac as cb

.the magic drawing . 622.we can exclude ac and as above 18000 ft cb will be met after a cold front exemple 336 ci.ci.

If radiation fog forms on a clear night with light winds the increase in wind ?

Question 136-27 : Cause the fog to lift and become low stratus change the radiation fog to advection fog have no effect disperse the fog immediately

exemple 340 cause the fog to lift and become low stratus.cause the fog to lift and become low stratus.

Clouds will mainly consist of supercooled water droplets when the temperature is ?

Question 136-28 : Between 0°c and 15°c between 5°c and 30°c between 30°c and 40°c below 40°c

exemple 344 between 0°c and -15°c.between 0°c and -15°c.

Frontal fog can be formed by ?

Question 136-29 : Condensation of air saturated by evaporation of precipitation condensation of air saturated by adiabatic cooling cooling at night evaporation of moisture at the surface

exemple 348 condensation of air saturated by evaporation of precipitation.condensation of air saturated by evaporation of precipitation.

Advection of very cold air over a warm sea current can cause ?

Question 136-30 : Steaming fog advection fog no fog at all frontal 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 exemple 352 steaming fog.steaming fog.

As a result of diurnal variation radiation fog is lifted and a cloud cover is ?

Question 136-31 : Low stratus will develop caused by increasing wind speed low stratus will develop caused by radiation in combination with low geostrophic wind speed layers of altocumulus will develop caused by increasing wind speed stratocumulus will develop caused by insolation

.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 exemple 356 low stratus will develop caused by increasing wind speed.low stratus will develop caused by increasing wind speed.

In which situation is advection fog most likely to form ?

Question 136-32 : An air mass moving inland from the coast in winter a warm moist air mass on the windward side of the mountains a light breeze blowing colder air out to sea warm moist air settling over a warmer surface under no wind conditions

.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 exemple 360 an air mass moving inland from the coast in winter.an air mass moving inland from the coast in winter.

About ten identical clouds are in the sky well isolated from one another dense ?

Question 136-33 : Towering cumulus broken cumulus altocumulus castellanus stratocumulus

exemple 364 towering cumulus.towering cumulus.

Which of the following cloud types is classified as low level cloud ?

Question 136-34 : Sc as ac cs

Cqb15 july 2011.sc stratocumulus low level .cs cirrostratus high level .as altostratus medium level .ac altocumulus medium level exemple 368 sc.sc.

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

Question 136-35 : Cs sc ac st

Cqb15 july 2011.cs cirrostratus high level .sc stratocumulus low level .st stratus low level .ac altocumulus medium level. 503. exemple 372 cs.cs.

Which one of the displayed cloud forms is representative of a cumulus. 375 ?

Question 136-36 : 1 2 3 4

Cqb15 august 2011 exemple 376 1.1.

Which one of the following cloud types can be characterised by the optical ?

Question 136-37 : Cirrostratus altocumulus cumulonimbus nimbostratus

. 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 exemple 380 cirrostratus.cirrostratus.

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

Question 136-38 : Altostratus cirrostratus stratus stratocumulus

. 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 exemple 384 altostratus.altostratus.

What cloud type can produce freezing rain ?

Question 136-39 : Nimbostratus stratus cumulonimbus stratocumulus

505 exemple 388 nimbostratus.nimbostratus.

Frontal fog is most likely to dissipate ?

Question 136-40 : After the passage of a warm front in advance of a warm front when the wind decreases when the wind veers

.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 exemple 392 after the passage of a warm front.after the passage of a warm front.

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