Which of the following causes echoes on meteorological radar screens ?
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Which of the following phenomena should be described as precipitation at the time they are observed ?
Which of the following meteorological phenomena can rapidly change the braking action of a runway ?
Which of following phenomena can produce a risk of aquaplaning only ra (rain) a precipitation which produce a risk of aquaplaning ('+ra' means 'heavy rain') fg fog bcfg fog patches sa sand. 
Which of these four metar reports suggests that rain most likely in next few hours 23 5kt 8 bkn 3 ovc 7 7/ 4 q 9 becmg 4 =. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. 
Precipitation in form of showers occurs from 23 5kt 8 bkn 3 ovc 7 7/ 4 q 9 becmg 4 =. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. 
A super cooled droplet A droplet still in liquid state at a temperature below °c. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. Question 138-8
Steady precipitation in contrast to showery precipitation falls from Stratiform clouds with little or no turbulence. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. Question 138-9
Supercooled droplets can occur in Clouds fog precipitation. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. Question 138-10
Supercooled droplets are always At a temperature below freezing. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. Question 138-11
The following statements deal with precipitation turbulence and icing select list containing most likely alternatives ns cloud Precipitation may be snow sleet or rain icing probable may range between light severe turbulence rarely more than moderate. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 = cloud base low visibility will reduced temperature dew point are close we have a high relative humidity rain can occur 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 = wind 2kt no clouds fog it will not lead rain 05016g33kt 8000 ovc015 08/06 q1028 nosig = too much wind visibility remains good 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig = too cold not enough clouds good visibility no wind. Question 138-12
From what type of cloud does drizzle fall Precipitation may be snow sleet or rain icing probable may range between light severe turbulence rarely more than moderate. stratus does not usually produce precipitation but when it does occur it in form of minute particles such as drizzle ice crystals or snow grains. Question 138-13
What type of clouds are associated with rain showers Towering cumulus cumulonimbus. shower rain/snow towering cumulus cumulus cumulonimbus continuous rain/snow nimbostratus shower rain short duration rain. Question 138-14
What type of clouds are associated with snow showers Cumulus cumulonimbus. shower rain/snow towering cumulus cumulus cumulonimbus continuous rain/snow nimbostratus shower rain short duration rain. Question 138-15
Which of following phenomena should be described as precipitation at time they are observed Cumulus cumulonimbus. shower rain/snow towering cumulus cumulus cumulonimbus continuous rain/snow nimbostratus shower rain short duration rain. Question 138-16
Which of following phenomena should be described as precipitation at time they are observed Cumulus cumulonimbus. shsn snow shower va volcanic ash br mist mifg shallow fog. Question 138-17
Solid precipitation which transparent or translucent and has a diameter of 5mm or less formed the freezing of raindrops or refreezing of melted snow and usually bounces off hard surfaces a description of Cumulus cumulonimbus. shsn snow shower va volcanic ash br mist mifg shallow fog. Question 138-18
During flight in clouds which of following means the best one to identify position of embedded cbs Cumulus cumulonimbus. shsn snow shower va volcanic ash br mist mifg shallow fog. Question 138-19
Which of following statements concerning airborne weather radar correct It shows on a plan position indicator areas of precipitation of rain snow and/or hail. shsn snow shower va volcanic ash br mist mifg shallow fog. Question 138-20
Snow grains Fall from stratus or supercooled fog. Stratus does not usually produce precipitation but when it does occur it in form of minute particles such as drizzle ice crystals or snow grains. Question 138-21
Which of following statements true concerning bergeron findeisen process It only takes place in clouds with supercooled water droplets ice crystals. The bergeron findeisen process can be summarized as such the air reaches saturation some of resulting droplets will come in contact with freezing nuclei (assuming they have reached activation temperature) we will now have a combination of ice crystals supercooled water droplets from perspective of supercooled droplets air in equilibrium at saturation but from perspective of ice crystals air supersaturated therefore water vapor will sublimate on ice crystals since amount of water vapor in air has decreased from perspective of supercooled water droplet air subsaturated supercooled water will evaporate until air once again reaches saturation the process then continues in short summary ice crystal grows through sublimation at expense of supercooled water droplet. Question 138-22
Which of following statements true concerning coalescence process In mid latitudes this process produces only drizzle or very light rain. cloud droplets are carried air currents within cloud if they bump into each other it called a collision however if they collide then stick together that called coalescence this process important especially in tropics in increasing size of raindrops it falls short of being primary mechanism the formation of raindrops the collision coalescence process of relatively little importance in middle high latitudes where even in summer precipitation begins high in clouds where temperatures are well below freezing the dominant precipitation producing mechanism the so called ice crystal or bergeron process. Question 138-23
The processes and/or effects which cause clouds to release precipitation are Coalescence process bergeron findeisen process. Quick overview of precipitation formation processes click here to open the video in a new window. Question 138-24
State code used to indicate moderate precipitation in form of snow flakes from a cumulonimbus cloud Coalescence process bergeron findeisen process. Quick overview of precipitation formation processes click here to open the video in a new window. Question 138-25
The size of a drizzle droplet Coalescence process bergeron findeisen process. Ecqb03 july 2016 drizzle a slowly falling precipitation in form of tiny water droplets with diameters less than 0 5 millimeters it falls from stratus clouds is often associated with low visibility fog stratus does not usually produce precipitation but when it does occur it in form of minute particles such as drizzle ice crystals or snow grains. Question 138-26
The presence of ice pellets at a height of 8000 ft indicates Freezing rain at heights above 8 ft. Ecqb03 july 2016 drizzle a slowly falling precipitation in form of tiny water droplets with diameters less than 0 5 millimeters it falls from stratus clouds is often associated with low visibility fog stratus does not usually produce precipitation but when it does occur it in form of minute particles such as drizzle ice crystals or snow grains. Question 138-27
The weather most likely to be experienced at position 'q' 414 Showery with generally good visibility. Ecqb03 july 2016 drizzle a slowly falling precipitation in form of tiny water droplets with diameters less than 0 5 millimeters it falls from stratus clouds is often associated with low visibility fog stratus does not usually produce precipitation but when it does occur it in form of minute particles such as drizzle ice crystals or snow grains. Question 138-28
Which statement best describes coalescence Droplets velocity increases with their radius those who have grown faster will fall faster than others will sweep smaller droplets. Ecqb03 july 2016 drizzle a slowly falling precipitation in form of tiny water droplets with diameters less than 0 5 millimeters it falls from stratus clouds is often associated with low visibility fog stratus does not usually produce precipitation but when it does occur it in form of minute particles such as drizzle ice crystals or snow grains. Question 138-29
Which of following typical the passage of an active cold front in summer Mainly towering clouds. an active cold front pushing warm moist air up from underneath producing some layered cloud but almost always cumulus cloud turbulent weather when front has passed through air now cold therefore more dense dense air higher pressure. Question 138-30
Examining pictures on which one of tracks dashed lines this cross section to be expected 250 Mainly towering clouds. only one dashed line crosses two fronts (a cold front a warm front). Question 138-31
Frontal depressions can be assumed to move in direction of 2000 feet wind Mainly towering clouds. the isobars in warm sector tend to be parallel straight give an indication in direction of system until it occludes isobars indicate direction of wind at least at 2000 ft above surface (the free stream unaffected surface friction). Question 138-32
What types of cloud will you meet flying towards a warm front At some 8 km cs later as at some 3 km ns until front. when approaching an active warm front at medium to low level you can expect a low cloud base poor visibility rain. Question 138-33
The polar front The boundary between polar tropical air masses. the polar front the boundary between polar air tropical air . Question 138-34
What are typical differences with regard to temperature and humidity between an air mass with its origin in azores and an air mass with its origin over northern russia The air of azores warmer more humid than north russian air. the polar front the boundary between polar air tropical air . Question 138-35
Where the source of continental tropical air that affects europe in summer The southern balkan region the near east. the polar front the boundary between polar air tropical air . Question 138-36
Where does polar continental air originate The southern balkan region the near east. the polar front the boundary between polar air tropical air . Question 138-37
What type of fronts are most likely to be present during winter in central europe when temperatures close to ground are below 0°c and freezing rain starts to fall Warm fronts warm occlusions. freezing rain associated with warm fronts warm occlusions in a warm front freezing level lower than behind (in warm sector) 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 . Question 138-38
Which of following conditions are you most likely to encounter when approaching an active warm front at medium to low level Low cloud base poor visibility. when approaching an active warm front at medium to low level you can expect a low cloud base poor visibility rain. Question 138-39
During a cross country flight at fl 50 you observe following sequence of clouds nimbostratus altostratus cirrostratus cirrus which of following are you most likely to encounter Decreasing temperatures. the cloud types described will be found in a warm front you are flying from warm sector through warm front in direction of cold sector outside temperature will be decreasing. Question 138-40
What cloud formation most likely to occur at low levels when a warm air mass overrides a cold air mass Decreasing temperatures. a warm air mass overrides a cold air mass this a warm front at low levels you will have stratus nimbostratus.
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