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Question 149-1 : Which one of the displayed cloud forms is representative of altocumulus castellanus . 253 ? [ Certification weather ]

N°3


Question 149-2 : What is the main composition of clouds classified as 'high level clouds' ?

Ice crystals

Admin .cirrus cirrocumulus and cirrostratus clouds are very high clouds and they are composed of ice crystals . 503 exemple 253 Ice crystals.

Question 149-3 : A plain in western europe with an average elevation of 500 m 1600 ft above sea level is covered with a uniform ac layer of cloud during the summer months at what height above the ground is the base of this cloud to be expected ?

7000 15000 ft above the terrain

Admin . 503.altocumulus clouds are found at a mid level between 6000 and 20000 feet .there are 3 basic types of middle level clouds altocumulus altostratus and nimbostratus exemple 257 7000 - 15000 ft above the terrain.

Question 149-4 : Which of the following clouds may extend into more than one level ?

Nimbostratus

Admin . 503 exemple 261 Nimbostratus.

Question 149-5 : Which one of the following types of cloud is most likely to produce heavy precipitation ?

Ns

Admin .shower rain/snow towering cumulus cumulus and cumulonimbus .continuous rain/snow nimbostratus .shower rain short duration rain .continuous rain long duration = heavy precipitation exemple 265 Ns.

Question 149-6 : With what type of clouds are showers most likely associated ?

Cumulonimbus

Admin .shower rain/snow towering cumulus cumulus and cumulonimbus .continuous rain/snow nimbostratus .shower rain short duration rain .continuous rain long duration = heavy precipitation exemple 269 Cumulonimbus.

Question 149-7 : At what time of day or night is radiation fog most likely to occur ?

Shortly after sunrise

exemple 273 Shortly after sunrise.

Question 149-8 : What is the average vertical extent of radiation fog ?

500 ft

exemple 277 500 ft.

Question 149-9 : Which of the following weather conditions favour the formation of radiation fog ?

Light wind little or no cloud moist air

exemple 281 Light wind, little or no cloud, moist air.

Question 149-10 : Over central europe what type of cloud cover is typical of the warm sector of a depression during winter ?

St

Admin . 505.over europe in the warm sector behind a warm front you always find stratus regardless of the season exemple 285 St.

Question 149-11 : Of the four radio soundings select the one that indicates ground fog . 255 ?

N°2

Admin .when temperature and dew point are equals the air is satured and condensed water droplets will form cloud or for radio sounding n°2 indicates ground fog at the surface .radio sounding n°3 indicates that a layer of cloud is present above the surface exemple 289 N°2.

Question 149-12 : Which of the following cloud types can project up into the stratosphere ?

Cumulonimbus

Admin . 503.cumulonimbus clouds are the tallest clouds and can reach to the stratosphere the updraft in some strong cbs will bulge into the stratosphere exemple 293 Cumulonimbus.

Question 149-13 : What process in an air mass leads to the creation of wide spread ns and as cloud coverage ?

Lifting

Admin .lifting is a process leading to the creation of thin nimbostratus and altostratus cloud layer sinking will lead to the dissipation of clouds radiation will also dissipate clouds or generate a convective activity and will create cumulus clouds not ns or as exemple 297 Lifting.

Question 149-14 : Which of the following cloud is classified as low level cloud ?

St

Admin . 503 exemple 301 St

Question 149-15 : Which of the following is most likely to lead to the dissipation of radiation fog ?

A marked increase in wind velocity near the ground

exemple 305 A marked increase in wind velocity near the ground

Question 149-16 : Which of the following conditions is most likely to lead to the formation of steam fog arctic smoke ?

Cold air moving over warm water

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 309 Cold air moving over warm water

Question 149-17 : The lowest cloud base forecast at eta zurich 1200 utc is .lszh 061019 20018g30kt 9999 ra sct050 bkn080 tempo 23012kt 6000 dz bkn015 bkn030 becmg 1518 23020g35kt 4000 ra ovc010= ?

1500 ft

Admin .lszh 061019 20018g30kt 9999 ra sct050 bkn080 tempo 23012kt 6000 dz bkn015 bkn030 becmg 1518 23020g35kt 4000 ra ovc010=.the tempo group is used for any conditions in wind visibility weather or sky condition which are expected to last for generally less than an hour at a time occasional and are expected to occur during less than half the time period .at 1200 utc the lowest cloud base forecast is 1500 ft .the most likely cloud base forecast will be 8000 ft bkn080 between 1000 utc to 1500 utc .note a cloud base is few or sct a cloud ceiling is bkn or ovc exemple 313 1500 ft.

Question 149-18 : Extensive cloud and precipitation is often associated with a non frontal thermal depression because of ?

Surface convergence and upper level divergence causing widespread ascent of air in the depression

Admin . 532.the cloud is caused by ascending air with divergence at height and convergence at the surface exemple 317 Surface convergence and upper level divergence causing widespread ascent of air in the depression.

Question 149-19 : Which of the following meteorological phenomenon indicates upper level instability which may lead to thunderstorm development ?

Ac castellanus

exemple 321 Ac castellanus.

Question 149-20 : Which type of fog is likely to form when air having temperature of 15°c and dew point of 12°c blows at 10 knots over a sea surface having temperatures of 5°c ?

Advection fog

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 325 Advection fog.

Question 149-21 : What type of fog is most likely to form over flat land during a clear night with calm or light wind conditions ?

Radiation

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 329 Radiation.

Question 149-22 : Which types of clouds are typical evidence of stable air conditions ?

St as

Admin .strat = stability exemple 333 St, as

Question 149-23 : Which one of the displayed cloud forms is representative of altocumulus lenticularis . 295 ?

N°2

exemple 337 N°2.

Question 149-24 : Which one of the displayed cloud forms is representative of a cumulonimbus capillatus . 296 ?

N°4

Admin .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 exemple 341 N°4.

Question 149-25 : A plain in western europe with an average height of 500 m 1600 ft above sea level is covered with a uniform sc layer of cloud during the summer months at what height above the ground is the base of this cloud to be expected ?

1500 7000 ft above ground

Admin . 503.stratocumulus are low level clouds .during the summer months the land warms up and the cloud base goes up this is the reason why sc will not be found below 1500 ft exemple 345 1500 - 7000 ft above ground.

Question 149-26 : A plain in western europe with an average height of 500 m 1600 ft above sea level is covered with a uniform cc layer of cloud during the summer months at what height above the ground is the base of this cloud to be expected ?

15000 35000 ft above the terrain

Admin .cirrocumulus cc are high level clouds . 503.the base of the layer can be expected between 15000 ft up to 35000 ft exemple 349 15000 - 35000 ft above the terrain.

Question 149-27 : Which of the following cloud types is found at high levels ?

Ci

Admin . 503 exemple 353 Ci.

Question 149-28 : Which of the following cloud types is a medium level cloud ?

As

Admin . 503 exemple 357 As.

Question 149-29 : Under which of these conditions is radiation fog most likely to form ?

Little or no cloud

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 361 Little or no cloud.

Question 149-30 : Which of the following is most likely to lead to the formation of radiation fog ?

Heat loss from the ground on clear nights

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 365 Heat loss from the ground on clear nights

Question 149-31 : Of the four radio soundings select the one that indicates low stratus . 298 ?

N°3

Admin .when temperature and dew point are equals the air is satured and condensed water droplets will form cloud or fog radio sounding n°2 indicates ground fog at the surface .radio sounding n°3 indicates that a layer of cloud is present above the surface exemple 369 N°3.

Question 149-32 : In which of the following metar reports is the probability of fog formation in the coming night the highest ?

201850z 15003kt 6000 sct120 05/04 q1032 becmg 1600 br=

Admin .light wind below 5 kt little or no cloud clear night only one degree between temperature and dew point .visibilty will fall from 6000 m to 1600 m and br mist indicates moist air .this conditions will lead to the formation of radiation fog moist air over land with heat loss from the ground on clear nights exemple 373 201850z 15003kt 6000 sct120 05/04 q1032 becmg 1600 br=

Question 149-33 : Which airport is most likely to have fog in the coming night . 302 ?

Lszh

Admin .radiation fogs occur at night and usually do not last long after sunrise radiation fog is common in autumn and early winter north hemisphere .radiation fog is formed by the cooling of land after sunset by thermal radiation in calm conditions with clear sky .the cool ground produces condensation in the nearby air by heat conduction in the next 8 hours ekch engm and essa will be covered by the second perturbation arriving from the west with winds rains and clouds .only zurich airport lszh will remains clear from the bad weather area allowing radiation fog development exemple 377 Lszh.

Question 149-34 : Which of the following cloud types are most likely to produce light to moderate icing when they are not subject to orographic lifting and consist of supercooled cloud droplets ?

Altocumulus and altostratus

Admin .cirrocumulus and cirrostratus are high altitude clouds no supercooled cloud droplets .cumulonimbus it produces light moderate and severe icing .it remains only the 'altos' altocumulus and altostratus exemple 381 Altocumulus and altostratus.

Question 149-35 : Altostratus clouds are classified as ?

Medium level clouds

Admin . 503 exemple 385 Medium level clouds

Question 149-36 : A cumulonimbus cloud at mid latitudes in summer contains ?

Ice crystals water droplets and supercooled water droplets

exemple 389 Ice crystals, water droplets and supercooled water droplets

Question 149-37 : Strongly developed cumulus clouds are an indication of ?

Instability in the atmosphere

exemple 393 Instability in the atmosphere.

Question 149-38 : Clouds classified as being low level are considered to have bases from ?

The surface to 6500 ft

Admin . 503 exemple 397 The surface to 6500 ft.

Question 149-39 : Which of the following are medium level clouds ?

Altostratus and altocumulus

Admin . 503 exemple 401 Altostratus and altocumulus.

Question 149-40 : Cumulus clouds are an indication for ?

Up and downdrafts

Admin .it means instability exemple 405 Up and downdrafts.


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