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Question 150-1 : A generally grey cloud layer with fairly uniform base and uniform appearance which may give drizzle or snow grains when the sun is visible through the cloud the outline is clearly discernible sometimes it appears in the form of ragged patches .what type of cloud is being described ? [ Learning aircraft ]

Stratus

exemple 250 Stratus.

Question 150-2 : The presence of altocumulus castellanus indicates ?

Instability in the middle troposphere

exemple 254 Instability in the middle troposphere.

Question 150-3 : In an area of converging air in low level ?

Clouds can be formed

Admin . 563.divergence in the upper air means convergence on the ground this a low pressure area and clouds may appears above it exemple 258 Clouds can be formed.

Question 150-4 : When the temperature and dew point are less than one degree apart the weather conditions are most likely to be ?

Fog or low cloud

exemple 262 Fog or low cloud.

Question 150-5 : The morning following a clear calm night when the temperature has dropped to the dewpoint is likely to produce ?

Radiation fog

Admin .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 266 Radiation fog.

Question 150-6 : Advection fog can be formed when ?

Warm moist air flows over a colder surface

Admin .advection fog warm moist air mass moving over a cold surface without too much wind ..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 270 Warm moist air flows over a colder surface.

Question 150-7 : Steaming fog arctic sea smoke occurs in air ?

With cold mass properties

Admin .steam fog also known as steaming fog evaporation fog frost smoke or arctic sea smoke occurs when evaporation takes place into cold air lying over warmer water . 569.it is named by analogy with the condensed vapor or steam which appears above water which is heated invisible vapor is given off from the water but is almost immediately recondensed as it comes into contact with the colder air the air has to be much colder than the water so that convection currents develop formation also requires that there is . a marked surface temperature inversion in the air before it moves over the sea or inland water bodies so as to preclude the lapse rate becoming unstable through a deep layer . a low air temperature typically 0°c or below so that a comparatively small amount of moisture can produce supersaturation otherwise the heating process will outweigh the tendency towards saturation .because of these requirements this type of fog is usually only formed over water surfaces near to a source of cold air such as frozen ground or ice sheets in polar regions one classic occurrence is following the sudden break up of sea ice to expose relatively warm water in the steep sided fjords along parts of the icelandic and norwegian coasts and similar environments elsewhere steam fog may reach a depth of 500 feet or more and drift over adjacent land areas whilst relatively rare in temperate latitudes cold air which collects in and then drifts down large river valleys and out over a relatively warm sea surface in very light wind conditions can occasionally lead to the formation of smaller and much shallower areas of this type of fog in winter exemple 274 With cold mass properties.

Question 150-8 : Frontal fog is most likely to occur ?

In advance of a warm front

Admin .the passage of a warm front can be associated with areas of fog the types of fog just in advance of a warm front is frontal fog and just after the passage is advection fog .frontal fog is caused by the additional moisture in the air due to the evaporation of rain or drizzle .the different types of 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 278 In advance of a warm front.

Question 150-9 : Freezing fog exists if fog droplets ?

Are supercooled

exemple 282 Are supercooled.

Question 150-10 : Which of the following circumstances most favour the development of radiation fog ?

Moist air over land during clear night with little wind

exemple 286 Moist air over land during clear night with little wind

Question 150-11 : Fallstreaks or virga are ?

Water or ice particles falling out of a cloud that evaporate before reaching the ground

Admin . 2542 exemple 290 Water or ice particles falling out of a cloud that evaporate before reaching the ground.

Question 150-12 : The range of wind speed in which radiation fog is most likely to form is ?

Below 5 kt

exemple 294 Below 5 kt.

Question 150-13 : At the top of orographic waves in mountainous regions the cloud most likely to be encountered is ?

Altocumulus lenticularis

Admin . 433. 2540 exemple 298 Altocumulus lenticularis.

Question 150-14 : A cumulus congestus is ?

A cumulus that is of great vertical extent

exemple 302 A cumulus that is of great vertical extent.

Question 150-15 : Clouds in patches sheets or grey or whitish layers made up of elements resembling large pebbles or rollers together or not and always clear of the ground are ?

Stratocumulus

Admin . 597 exemple 306 Stratocumulus.

Question 150-16 : In mid latitudes the tops of cumulus are often limited by ?

A temperature inversion

Admin .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 310 A temperature inversion.

Question 150-17 : Of what does lenticular cloud provide evidence ?

Mountain waves

exemple 314 Mountain waves.

Question 150-18 : The formation of morning fog before sunrise is possible if ?

Air temperature and dew point are equal or close to one another

exemple 318 Air temperature and dew point are equal or close to one another.

Question 150-19 : What is the difference between radiation fog and advection fog ?

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

Admin .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 322 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.

Question 150-20 : When fog is reported the visibility is below ?

1 km

Admin .mist is defined as visibility between 1 and 5 kilometers .below 1 km we talk about fog exemple 326 1 km.

Question 150-21 : When visibility is reduced by water droplets to less than 1000 metres it is classified as ?

Fog

Admin .mist is defined as visibility between 1 and 5 kilometers .below 1 km we talk about fog exemple 330 Fog.

Question 150-22 : Which cloud type may indicate the presence of severe turbulence ?

Altocumulus lenticularis

exemple 334 Altocumulus lenticularis

Question 150-23 : Which is true of advection fog ?

It can appear suddenly by day or by night

Admin .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 338 It can appear suddenly by day or by night.

Question 150-24 : 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

Admin .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 342 A mild moist airstream flowing over colder surfaces with the wind speed less than 15 kt.

Question 150-25 : Which of the following types of cloud can extend over the low medium and high cloud levels ?

Cb

Admin . 503 exemple 346 Cb.

Question 150-26 : Which of the following types of clouds are evidence of unstable air conditions ?

Cu cb

exemple 350 Cu, cb.

Question 150-27 : Which type of fog can not be formed over water ?

Radiation fog

Admin .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 354 Radiation fog.

Question 150-28 : 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

Admin .turbulence cloud is formed within the turbulence layer because mixing of the air modifies the temperature exemple 358 In the friction layer mixing occurs by turbulence and the condensation level is situated below the top of the turbulent layer.

Question 150-29 : Radiation fog most frequently occurs in ?

High pressure systems over land

exemple 362 High pressure systems over land.

Question 150-30 : What kind of fog is often observed in the coastal region of newfoundland in spring time ?

Advection fog

Admin .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 366 Advection fog.

Question 150-31 : Which statement is correct ?

Fog can be supercooled and can also contain ice crystals

exemple 370 Fog can be supercooled and can also contain ice crystals.

Question 150-32 : The cloud type most applicable to square 3c is . 355 ?

Ns

Admin . 559 exemple 374 Ns.

Question 150-33 : The cloud type most applicable to square 2d is . 356 ?

As

Admin .square 2d 7000 ft to 18000 ft. 622.the most applicable cloud type are ns and as exemple 378 As.

Question 150-34 : The cloud most likely to be experienced in square 1e is . 357 ?

Ci

Admin .the magic drawing . 622.we can exclude ac and as above 18000 ft cb will be met after a cold front exemple 382 Ci.

Question 150-35 : 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

exemple 386 Cause the fog to lift and become low stratus.

Question 150-36 : Clouds will mainly consist of supercooled water droplets when the temperature is ?

Between 0°c and 15°c

exemple 390 Between 0°c and -15°c.

Question 150-37 : Frontal fog can be formed by ?

Condensation of air saturated by evaporation of precipitation

exemple 394 Condensation of air saturated by evaporation of precipitation.

Question 150-38 : Advection of very cold air over a warm sea current can cause ?

Steaming fog

Admin .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 398 Steaming fog.

Question 150-39 : 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

Admin .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 402 Low stratus will develop caused by increasing wind speed.

Question 150-40 : In which situation is advection fog most likely to form ?

An air mass moving inland from the coast in winter

Admin .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 406 An air mass moving inland from the coast in winter.


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