Meteorology Test Astana

In AS cloud at FL170 and a temperature of -20°C the airframe icing most likely to be experienced is: Severe clear icing. Light rime icing. Hoar frost. Moderate clear icing.

At a station equipped with IRVR, reports are given: When there is mist. When the normal visibility is 1500 m or less. When there is haze. Every 1/2 hour.

Thunderstorms caused by_________are most common in the summer and by_________in the_________. Convection / frontal activity / winter. Convection / frontal activity / summer. Cold fronts / air masses / autumn. Lapse rate / air masses / late spring.

Flying in large CU at a temperature of -20°C, the amount of each cloud droplet that will freeze on impact with the aircraft will be: All the droplet. ¼ of the droplet. 20% of the droplet. ½ of the droplet.

After passage of an occluded front in the Northern Hemisphere: Wind Temperature Precipitation. Veers drops or rises begins to dry up. Backs rises quickly increases in strength. Veers drops rapidly stops abruptly. Backs stops falling continues.

The most extreme turbulence can occur: At B2.3, 4 and at C2, 3.4. At ABC 4. At B1. At A2.

At temperatures of between 0°C and -10°C clouds will consist of: Entirely ice crystals. Mostly water vapour. Mostly supercooled water droplets and a few ice crystals. Entirely water droplets.

Carburetor icing is unlikely: At temperatures between -10°C and -30°C. When the relative humidity is 40%. In cloud. In clear air.

Hail will not grow by the collision with ice crystals. Changes of RVR are reported for increments of: 25 m up to 400 m. 25 m up to 250 m. 50 m between 500 m and 800 m. 50 m between 300 m and 800 m.

When air from an air mass and moves to a lower latitude, it can be expected that: Surface layer air will become colder, the relative humidity will rise and the air will become more stable. Surface layer air will become warmer, the relative humidity will rise and the air will become unstable. Surface layer air will become warmer, the relative humidity will fall and the air will become unstable. Surface layer air will become warmer, the relative humidity will fall and the air will become more stable.

Which of the following will indicate medium level instability, possibly leading to thunderstorms?. Halo. Altocumulus Capillatus. Red Cirrus. Altocumulus Castellanus.

In comparison with a primary depression a secondary depression is: Always more active. Sometimes more active. Unlikely to produce gale force winds. Never more active.

Which of the conditions below would lead to the worst icing condition: Size of Drop - Ambient Temp. 3mm -12°C. 1mm -1°C. 2mm -30°C. 5mm -4°C.

The weather associated with polar maritime air is: Broken cloud, moderate continuous rain. Broken cloud, light, moderate or heavy rain. Overcast moderate intermittent rain. Overcast, moderate drizzle.

With a cold occlusion: The air ahead of the warm front is colder than the air behind the cold front. The cloud type is predominately layer with a wide precipitation band. There is a risk of CB embedded in NS. The warm sector remains on the surface.

Which of the following statements accurately describes the West African tornado?. Itis another name for the cyclones that affect the West African coast in summer. Itis a line of thunderstorms producing a line squall aligned roughly north/south. The West African tornado is similar to the North American and European tornadoes. Itis the name given to a line of thunderstorms that lie along the ITCZ but some 200 miles to the south.

Clear air turbulence, in association with a polar front jet stream in the Northern Hemisphere, is more severe: Underneath the jet core. Looking downstream on the right hand side. Looking downstream on the left hand side. In the centre of the jet core.

In grid square M6 the worst cloud conditions for flying could be: Cumulonimbus embedded in nimbostratus. Cumulonimbus. Nimbostratus. Altrocumulus.

Clear air turbulence (CAT) should be reported whenever it is experienced. What should be reported if crew and passengers feel a definite strain against their seat or shoulder straps, food service and walking is difficult and loose objects become dislodged?. Moderate TURB. Extreme TURB. Light TURB. Severe TURB.

Hazards of the mature stage of a TS cell include lightning, turbulence and: Icing, microburst and windshear. Windshear, hail and fog. Microburst, windshear and anvil. Icing, drizzle and microburst.

With reference to tropical revolving storms, which of the following statements is correct?. Cyclones occur in the Bay of Bengal in winter. Typhoons are found in the South China sea in January. Hurricanes in the South Atlantic sometimes affect the east coast of Brazil. Hurricanes affect the southeast of the USA in late summer.

The wind at square A3 is likely to be: light. 25 kt. 35 kt. 50 kt.

How long approximately does a cumulonimbus cell take to complete the full cycle from the cumulus (building) to dissipating stage?. About 1 hour. 1-2 hours. 4-5 hours. 2-3 hours.

Tropical revolving storms usually: Move in an easterly direction before recurving towards the nearest pole. Do not form within 5° of the Equator. Move in a westerly direction before recurving towards the Equator. Form close to one side of the Equator and while moving slowly in a westerly direction, cross over to the other hemisphere.

A thermal depression is likely to form: On the trailing edge of a warm sector mid latitude depression. In association with a marked trough of low pressure over the USA. In the lee of the Alps over northern Italy in winter. Over the Iberian peninsular during the summer.

Precipitation will reach the ground mainly in the area: J14-014. L14-R14. 014-T14. Ql4-S14.

The significance of lenticular cloud is: A katabatic wind is present which may lead to fog in the valleys. A Fohn wind can be expected with no turbulence. There are mountain waves present but they may not give severe turbulence. There may be mountain waves present and there will be severe turbulence.

Mountain waves can occur: In the stratosphere and troposphere. Above the mountain and downwind up to a maximum height at the tropopause and 50 NM to 100 NM downwind. Up to mountain height only and 50 NM to 100 NM downwind. Up to a maximum of 5000 ft above the mountains and 50 NM to 100 NM downwind.

The cloud in grid square N12 is most likely to be: Cumulonimbus. Cirrus. Altocumulus. Nimbostratus.

When flying in IMC in a region close to a range of hills 2000 ft high, in stable air and with wind direction at right angles to the axis of the range of hills, which of the following is probably the most dangerous practice: Flying towards the hills, into the wind, at flight level 65. Flying parallel to the hills on the upwind side at flight level 40. Flying towards the hills downwind at flight level 55. Flying parallel to the hills on the downwind side at flight level 40.

What are lenticularis clouds a possible indication of?. Mountain waves. Instability. Developing Cu and Cb. Horizontal windshear in the upper atmosphere.

Which of the following statements referring to jet streams is correct?. The core of a jet stream is usually located just below the tropopause in the colder air mass. The maximum wind speed in a jet stream increases with increase of height up to the tropopause and remains constant thereafter. The rate of change of wind speed at any given level is usually greatest on the warmer side of the jet. Turbulence associated with jet streams is probably associated with the rapid windshear in the vicinity of the jet.

Flying conditions in Ci cloud and horizontal visibility: Less than 500 m vis, light/mod clear icing. Greater than 1000 m vis, no icing. Less than 500 m vis, no icing. Greater than 1000 m vis. light/mod rime ice.

On a significant weather chart, the thunderstorm symbol signifies: Moderate turbulence and moderate icing. Moderate/severe turbulence and/or moderate/severe icing. Moderate turbulence and severe icing. Severe turbulence and severe icing.

Several types of pressure distribution may be associated with radiation fog but all have one feature in common which is: CI a slack pressure gradient. A tight pressure gradient. Closely spaced isobars. Rapidly falling pressure.

Fair weather cumulus gives an indication of: Poor visibility. Smooth flying below. Turbulence. Thunderstorms.

What type of cloud is associated with drizzle?. Ci. Cb. St. Ac.

What type of cloud extends into another level?. Acc. As. Ns. Ci.

Hail grows by: collision with ice crystals. up and down progress in CU cloud. collision with supercooled water drops. freezing as it leaves the cloud.

A microburst usually lasts for________and is about________across. 5 minutes 5 km. 30 minutes 10 NM. 20 minutes 20 NM. 45 minutes 5 NM.

The wind at A, B & C 4 may be: 40 kt. 35 kt. 50 kt. Aa jet stream.

In what cloud is icing and turbulence most severe?. Sc. Ci. Ns. Cb.

Regarding thunderstorms, the most accurate statement amongst the following is: The average movement is in accord with the wind at 10.000 ft. There will always be windshear under the cloud. The number of lightning flashes is directly proportional to the degree of turbulence. If the cloud base has a temperature below 0°C then freezing rain will occur.

Fog may be defined as: A reduction of visibility to less than 1000 metres due to the presence of water vapour in the atmosphere. A reduction of visibility to less than 1500 metres due to the presence of water droplets in suspension in the atmosphere. A reduction of visibility to less than 1000 ft due to the presence of water vapour in suspension in the atmosphere. A reduction of visibility to less than 1000 metres due to the presence of water droplets in suspension in the atmosphere.

For the formation of mountain waves, the wind above the level of the ridge should: Increase with little change in direction. Increase initially then decrease. Increase and then reverse in direction. Decrease or even reverse direction.

Ceilometer measure: Turbulence. Cloud height. RVR. Met vis.

The following is unlikely to be a hazard below a thunderstorm: Severe turbulence. Windshear. Severe icing. Large variations in pressure setting values.

During the_____stage of a thunderstorm cell, the cloud contains_____ Complete the above statement correctly using one of the following: Building/down currents only. Mature/up currents and down currents. Dissipating/up currents and down currents. Building/up currents and down currents.

Which cloud would you encounter the most intensive rain?. Sc. St. Ns. Ci.

The air masses involved in the development of a polar front depression are: Polar Maritime and Tropical Maritime. Tropical Continental and Polar Maritime. Polar Maritime and Polar Continental. Tropical Maritime and Polar Continental.

What cloud does hail fall from?. Ci. Ns. Cu. Cb.

When moist air moves across France in the_____TS activity is common in southern UK in the_____ Complete the above statement correctly using one of the following: Winter/morning. Summer/morning. Summer/late afternoon or evening. Winter/late afternoon or evening.

Tropical continental air normally brings to the UK: Hot dry cloudless weather on coasts but Cu building up inland with rain howers, visibility good except in showers. Hot dry cloudless weather with a thick haze. Warm dry cloudless weather with very good visibility. Warm weather with broken Cu and showers on coasts, visibility very good except in showers.

In the Northern Hemisphere when flying in the troposphere above the surface friction layer in the polar maritime air mass behind the cold front of a fully developed frontal depression: The wind will tend to veer in direction and increase in speed with progressive increase of altitude. The wind will tend to veer in direction with increase of altitude but the speed may remain constant in the lower layers of the atmosphere. The wind will tend to back in direction and increase in speed with progressive increase of altitude. The wind speed will reduce progressively with increase of altitude until at about 10000 feet above mean sea level where it will then tend to increase in speed from another direction.

Polar maritime air is_____and can bring_____in the UK in winter but_____in summer. Complete the above sentence correctly using one of the following: Cold and stable/advection fog/rain showers. Very unstable/heavy snow showers/does not arrive. Unstable/intermittent or continuous snow/cool dry weather. Unstable/heavy showers/light rain showers.

When flying from west to east through a cold occlusion (below the warm air) over the North Atlantic you would expect the wind to_____and the temperature to_____. Veer/increase. Back/decrease. Back/increase. Veer/decrease.

Which of the following conditions is most favorable for the formation of carburetor icing if the aircraft is descending with glide power set? Relative Humidity Ambient Temperature. 40% +20°C. 30% -5°C. 50% -10°C. 25% +25°C.

Clear ice forms as a result of: Water vapour freezing to the aircraft. Large supercooled water droplets spreading as they freeze. Small supercooled water droplets splashing over the aircraft. Ice pellets splattering on the aircraft.

Most cases of serious piston engine icing occur in cloud, fog, or precipitation with a temperature range between: -20°C to +15°C. -10°C to +25°C. -18°Cto +5°C. -10°Cto 0°C.

A mountain range is aligned in an east/west direction. Select the conditions from the table below that will give rise to mountain waves at 2000 ft 5000 ft 10 000 ft: 170/20 190/40 210/60. 090/20 090/40 090/60. 020/40 020/30 020/50. 270/15 270/20 270/40.

A secondary depression would form in association with: A polar front low. A col. A polar depression. A summer thermal depression over the Mediterranean or Caspian Sea.

Turbulent clouds are most serious from the icing standpoint because: Strong vertical currents mean that a predominance of small supercooled water droplets will be present. Turbulent clouds produce hail which sticks to the aircraft. Turbulent clouds indicate a low freezing level. Strong vertical currents mean that a predominance of large supercooled water droplets will be present.

What would be reflected to radar?. Hail. Mist. Cloud. Fog.

A plain in Western Europe at 500 m (1600 ft) AMSL is covered with a uniform altocumulus cloud during summer months. At what height AGL is the base of the cloud expected?. 1500 - 7000 ft. 7000 - 15000 ft. 15000 - 25000 ft. 100 - 1500 ft.

Tropical revolving storms: Have internal wind speeds of 10-20 knots rotating cyclonically round a subsiding clear air core known as the eye. Regenerate after crossing the coast from sea to land. Usually have the most severe weather in the quadrant to the right of the track in a hurricane. Are always given a male first name beginning with "A" for the first of the season and thereafter named in alphabetical order of occurrence.

Which symbol on a significant weather chart represents Freezing Precipitation?. c. c.

If air in transit is heated from below it tends to become more: none of these. Unstable. Neutrally stable. Stable.

Maximum turbulence associated with the mountain waves is likely to be: Just below the tropopause above the ridge. Down the lee side of the ridge and along the surface. Two wavelengths downwind and just above the surface. Approximately one wavelength downwind of, and approximately level with, the top of the ridge.

Thunderstorms are likely if: Air is unstable, there is sufficient water vapour and there is trigger action. There is a col in winter. Air is completely stable, there is sufficient water vapour and there is lifting orographically. There is a warm front.

________forms when moist air________over a surface which is________than the dew point of the air. Fill in the missing words from the list given below: Radiation fog, passes, warmer. Radiation fog, settles, warmer. Advection fog, settles, cooler. Advection fog, passes, cooler.

Thunderstorms require a trigger action to release the conditional instability. Which of the following would be the least suitable as a trigger?. Subsidence in tropical latitudes. Convergence in tropical latitudes. Convection in polar latitudes. Convergence in temperate latitudes.

The conditions which must exist to allow thunderstorms to develop are: A plentiful supply of moisture and a steep lapse rate through a large vertical extent and a trigger action. A trigger action, a plentiful supply of moisture and a very stable atmosphere. A steep lapse rate through a large vertical extent, a low relative humidity and a trigger action. A steep lapse rate. a stable atmosphere through a large vertical extent and a plentiful supply of moisture.

A north/south mountain range, height 10.000 ft is producing marked mountain waves. The greatest potential danger exists for an aircraft flying: At FL350 over and parallel to the ridge. Above a line of clouds parallel to the ridge on the lee side at FL25. Towards the ridge from the lee side at FL140. On the windward side of the ridge.

When flying through an active CB cloud, lightning strikes are most likely: In the temperature band between +10°C and -10°C. At or about 10.000 ft AMSL. In the clear air below the cloud in rain. Above 5000' and underneath the anvil.

Stratus cloud of limited depth at a temperature of -5°C will most likely give: Light to moderate glaze ice. Light to moderate rime ice. Moderate to heavy glaze ice. Moderate to heavy rime ice.

When a cold front passes a station in the British Isles: The wind veers and the dew point rises. The wind veers and the dew point falls. The wind backs and the dew point falls. The wind backs and the dew point rises.

What cloud types are classified as medium cloud?. Ns + Sc. Cb + St. Ci + Cs. Ac + As.

Clouds classified as low level are considered to have a base height of: 1000 - 2000 ft. 500 - 1000 ft. 100 - 200 ft. The surface - 6500 ft.

CB cloud in summer contains: Water droplets. Water droplets, ice crystals and super cooled water droplets. Ice crystals. Water droplets and ice crystals.

In circumstances where there is a clear sky. calm wind and a high relative humidity in autumn: Radiation fog is likely at sunrise after previous mist. Hill fog can be expected. Advection fog will form. Radiation fog is likely over night.

For mountain waves to form, the wind direction must be near perpendicular to a ridge or range of mountains and the speed must: Increase with height within a stable layer above the hill. Increase with height within an unstable layer above the hill. Decrease with height within a stable layer above the hill. Decrease with height within an unstable layer above the hill.

The average upper winds at A1, B1 and C1 in Appendix A are respectively: Easterly, westerly, northwesterly. Southwesterly, westerly, northwesterly. Northwesterly, westerly, southwesterly. Southwesterly, westerly, northerly.

When approaching at FL300 a cumulonimbus cloud with an anvil top, pilots should aim to the cloud by NM___ horizontally. 10. 20. 15. 5.

The average surface level winds at A3, B3 and C3 in Appendix A are respectively: Southwesterly, westerly, northerly. Easterly, westerly, southwesterly. Westerly, westerly, southwesterly. Northwesterly, westerly, southwesterly.

What is the composition of Ci cloud?. Water droplets. Smoke particles. Super cooled water droplets. Ice crystals.

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

A warm occlusion occurs when: Cool air is forcing cold air aloft. Cool air is forcing warm air over cold air. Cold air is forcing cool air over warm air. Warm air is forcing cool air over cold air.

A 65kt wind bar is depicted by?. C. C.

Which of the following are thermal depressions?. The lows forming over flat land in summer, polar air depressions, tropical revolving storms, some of the lows which form over inland seas in winter. The equatorial trough, monsoon lows, some depressions over the central and eastern Mediterranean sea in summer. Tropical revolving storms, polar air depressions, tornadoes. The equatorial trough, polar air depressions, monsoon lows, orographic lows.

Relative humidity is: Air temperature over dew point temperature x 100. The actual amount of water vapour in a sample of air over the maximum amount of water vapour that the sample can contain x 100. Air temperature over wet bulb temperature x 100. The maximum amount of water vapour that a sample of air can contain over the actual amount of water vapour the sample does contain x 100.

Referring to the area of the North Atlantic, the mean position of the polar front in January is: From Newfoundland to southwest England. From Florida to the north of Scotland. From Newfoundland to the north of Scotland. From Florida to southwest England.

Advection fog: Only occurs at night and early morning. Will only clear by insolation. Is most likely with Polar Maritime air. Can sometimes last for 24 hours or more in winter.

Radiation fog is most likely: With a wind of 2-8 kt, a high density and the summer season. With a wind speed up to 15 kt, a clear sky and a high relative humidity. In an anticyclone in winter. On a hill in autumn.

Hoar frost forms on an aircraft when: The aircraft in subzero clear air suddenly enters a colder region. The aircraft in subzero clear air suddenly enters a warmer moist region. The aircraft suddenly enters a cloud at below freezing temperature. The aircraft suddenly enters a cloud which is at a higher temperature than the surrounding air.

Frontal fog is most likely to: Form to the rear of a warm front but only last for 4 to 6 hours. Form on a vigorous cold front and last for many hours. Form ahead of a vigorous fast-moving cold front. Form ahead of a warm front.

What will snow most likely fall from?. Ci. Ns. Cs. Ac.

Flying 50 NM ahead of a warm front out of cloud at 1000 ft in winter, with an ambient temperature of -8°C, there is a strong risk of: Clear ice in the form of rain ice. Hoar frost. Rime icing and carburetor icing. Structure damage caused by hail.

An air mass that has travelled over an ocean is known as: Maritime air and has a low humidity. Maritime air and has a high humidity. Continental air and has a low humidity. Continental air and has a high humidity.

Flight conditions at B1 are likely to be: Turbulent in breaking wave crests. Smooth. Turbulent due to marked up and down currents. Turbulent.

Altostratus is: A heap type cloud. A high level cloud. A medium level cloud. A low level cloud.

A north/south mountain range, height 10.000 ft is producing marked mountain waves. The greatest potential danger exists for an aircraft flying: Above a line of clouds parallel to the ridge on the lee side at FL25. Towards the ridge from the lee side at FL140. On the windward side of the ridge. At FL350 over and parallel to the ridge.