Aviation Meteorology Exam Questions and Answers|2025 Update

Aviation Meteorology Exam Questions and Answers|2025 Update If in a 1000 ft thick layer the temperature at the bottom of the layer is 10 c and at the top of the layer is 8 c then this layer is - Answer- conditionally unstable you are flying at 2500 FT/AGL, with a southernly wind, and intent to land at an airport, at sea level directly below. From approx which direction would you expect the surface wind (mid-lat, northern hem) - Answer- South-southeast When isobars, for an area in the mid-lats on a weather map, are close together, the wind is most likely to be - Answer- strong A layer is absolutely unstable if the temp decreases with height is - Answer- more than 3 C per 1000 ft An air mass is called stable when - Answer- the environmental lapse rate is low, with the vertical motion of air currents which statement is true for a conditionally unstable layer? - Answer- the layer is unstable for unsaturated air What prevents air from flowing directly from high pressure areas to low pressure areas? - Answer- Coriolis force Wind is caused by - Answer- horizontal pressure differences Which is true of the temperature at the tropopause? - Answer- It is higher in polar regions than in equatorial regions an inversion - Answer- an increase of temperature with height The temperature at 10,000 FT in the International Standard Atmosphere is: - Answer- -5°C If the surface temperature is 15°C, then the temperature at 10000 FT in a current of ascending unsaturated air is: - Answer- -15°C An aircraft lands at an airport (airport elevation 540 FT, Alt 29.38 in.Hg.) with the altimeter set to 29.92 in.Hg. What will it indicate? - Answer- 1080 ft An aircraft lands at an airport (airport elevation 1240 FT, Alt 29.77 in.Hg.). The altimeter is set to 29.92 in.Hg. The altimeter will indicate : - Answer- 1390 ft The barometric compensator of an altimeter is locked on reference 29.92 in.Hg. The aircraft has to land on a point with an elevation of 290 feet where the altimeter setting is 30.19 in.Hg. The reading on the altimeter on the ground will be: - Answer- 20 ft During a flight over the Gulf at FL100 from Tampa (Alt 29.90 in.Hg.) to New Orleans (Alt 29.90 in.Hg.), the true altitude is constantly increasing. What action, if any, should be taken? - Answer- None, the reason for the change is that the air around New Orleans is warmer than the air around Tampa Which of the following clouds are classified as medium level clouds in temperate regions? - Answer- AS, AC. With which of the following types of cloud is "+RA" precipitation most commonly associated? - Answer- NS What type of cloud is being described ? 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. - Answer- Stratus Which one of the following types of cloud is most likely to produce heavy precipitation? - Answer- NS With what type of cloud is "+TSRA" precipitation most commonly associated? - Answer- CB With what type of clouds are showers most likely associated? - Answer- Cumulonimbus Clouds, fog or dew will always be formed when: - Answer- Water Vapor Condenses. Subsidence is : - Answer- vertically downwards motion of air Half the mass of the atmosphere is found in the first - Answer- 18000 FT The wind direction in a METAR is measured relative to - Answer- true north What is the meaning of the abbreviation "SCT"? - Answer- 3-4 oktas Which thunderstorms generally develop in the afternoon in summer over land in moderate latitudes? - Answer- airmass thunderstorms If Kalamazoo reports a wind of 30012KT on the METAR, what wind velocity would you expect to encounter at a height of 2000 feet above the ground? - Answer- 32020 KT A microburst: - Answer- is always associated with thunderstorms At what time of the year are tornadoes most likely to occur in North America? - Answer- spring, summer The temperature at FL 80 is +6°C. What will the temperature be at FL 130 if the ICAO standard lapse rate is applied? - Answer- -4 Isobars, on the surface weather chart, connect positions with the same: - Answer- atmospheric pressure An air mass is called stable when the: - Answer- environmental lapse rate is low (<1.5°C per 1000 ft), with little vertical motion of air currents An aircraft is flying over the sea at FL 120, with a true altitude of 12000 feet; local altimeter setting is 29.92 in.Hg. What assumption, if any, can be made about the air mass in which the aircraft is flying? - Answer- its average temp is the same as the ISA An aircraft is flying through the Rockies on a warm summer's day. The weather is fine, and there is a high pressure system in the area. During the flight a mountain is passed level with its summit. Which of the following is true concerning the altitude reading given by the aneroid altimeter compared with the summit's elevation? - Answer- it will be lower than the elevation of the summit An aircraft is flying in the southern hemisphere at low altitude (less than 2000 FT) and going directly away from a centre of low pressure. What direction, relative to the aircraft, does the wind come from? - Answer- from left and slightly on the nose If Kalamazoo reports a wind of 08010KT on the METAR, what wind velocity would you expect to encounter at a height of 2000 feet above the ground? - Answer- 11020KT An outside air temperature of -35°C is measured while cruising at FL 200. What is the temperature deviation from the ISA at this level? - Answer- 10 degrees warmer than the ISA How does the height of the tropopause normally vary with latitude in the northern hemisphere? - Answer- it decreases from south to north The tropopause is lower - Answer- over the North Pole than over the equator What is the approximate composition of dry air by volume in the troposphere? - Answer- 21% oxygen, 78% nitrogen, and 1% other gases Convective activity over land in mid-latitudes (Michigan) is greatest in - Answer- summer in the afternoon If in still air the temperature decreases at an average of 3.5°C per 1000 ft increase in altitude. This temperature change is called: - Answer- ELR