AVIATION METEOROLOGY TEST PAPER 2026/2027
QUESTIONS AND ANSWERS RATED A+
✔✔Which statement is true for a conditionally unstable layer? - ✔✔The layer is unstable
for unsaturated air
✔✔An air mass is called stable when - ✔✔the environmental lapse rate is high, with no
vertical motion of air currents
✔✔Wind is caused by - ✔✔horizontal pressure differences
✔✔What prevents air from flowing directly from high pressure areas to low pressure
areas? - ✔✔Coriolis force
✔✔Subsidence is : - ✔✔vertically downwards motion of air
✔✔What is the meaning of the abbreviation "SCT"? - ✔✔3-4 oktas
✔✔What is the meaning of the abbreviation "BKN"? - ✔✔5 - 7 oktas.
✔✔The wind direction in a METAR is measured relative to - ✔✔true north
✔✔During the life cycle of a thunderstorm, which stage is characterized predominantly
by downdrafts? - ✔✔Dissipating stage
✔✔A microburst: - ✔✔is always associated with thunderstorms
✔✔Thunderstorms in exceptional circumstances can occur in a warm front if: - ✔✔the
warm air is convectively unstable.
✔✔Which of the statements is true concerning squall lines ? - ✔✔For severe squall
lines a SIGMET is issued
✔✔During which stage of thunderstorm development are rotor winds characterized by
roll clouds most likely to occur? - ✔✔Mature stage.
✔✔What feature is normally associated with the cumulus stage of a thunderstorm? -
✔✔Continuous updraft
✔✔The initial phase of a thunderstorm is characterized by: - ✔✔continuous updrafts
✔✔Thunderstorms reach their greatest intensity during the: - ✔✔mature stage.
, ✔✔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 at an altitude of its summit. What reading will the aneroid altimeter give,
compared to the summit's elevation? - ✔✔A lower altitude than the elevation of the
summit
✔✔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? - ✔✔None, the reason for the change is that the air around New Orleans is
warmer than the air around Tampa
✔✔How does temperature vary with increasing altitude in the ICAO standard
atmosphere below the tropopause? - ✔✔Decreases
✔✔Which is true of the temperature at the tropopause? - ✔✔It is higher in polar regions
than in equatorial regions
✔✔An isothermal layer is a layer of air in which the temperature - ✔✔remains constant
with height
✔✔The lowest assumed temperature in the International Standard Atmosphere (ISA) is:
- ✔✔-56.5°C
✔✔Refer to the following TAF extract:BECMG 1821 2000 BKN004 PROB30 BECMG
2124 0500 FG VV001What does the abbreviation "VV 001 " mean? - ✔✔Vertical
visibility 100 FT.
✔✔Which of the following statements decodes correctly the following SIGMET:SIGMET
VALID 121420/121820 embd ts obs and fcst in w part of chi fir / mov e / intst nc = -
✔✔Thunderstorms must be expected in the western part of the Chicago FIR. The
thunderstorm zone is moving east. Intensity is constant
✔✔Given the following TAF for Kalamazoo airport:KAZO 281601 14010KT 4SM -RA
SCT025 BECMG 1618 12015G25KT SCT008 BKN013 TEMPO 1823 2SM RA BKN005
OVC010 BECMG 2301 25020KT 5SM BKN020 =If the ETA is 2100 UTC at Kalamazoo,
what is the lowest cloud base forecast for arrival? - ✔✔500 FT
✔✔In the following TAF extract,BECMG 1821 2000 BKN004 PROB30 BECMG 2124
0500 FG VV001What does the abbreviation 'PROB30' mean? - ✔✔30% probability of
the conditions occurring.
✔✔Refer to diagram.
QUESTIONS AND ANSWERS RATED A+
✔✔Which statement is true for a conditionally unstable layer? - ✔✔The layer is unstable
for unsaturated air
✔✔An air mass is called stable when - ✔✔the environmental lapse rate is high, with no
vertical motion of air currents
✔✔Wind is caused by - ✔✔horizontal pressure differences
✔✔What prevents air from flowing directly from high pressure areas to low pressure
areas? - ✔✔Coriolis force
✔✔Subsidence is : - ✔✔vertically downwards motion of air
✔✔What is the meaning of the abbreviation "SCT"? - ✔✔3-4 oktas
✔✔What is the meaning of the abbreviation "BKN"? - ✔✔5 - 7 oktas.
✔✔The wind direction in a METAR is measured relative to - ✔✔true north
✔✔During the life cycle of a thunderstorm, which stage is characterized predominantly
by downdrafts? - ✔✔Dissipating stage
✔✔A microburst: - ✔✔is always associated with thunderstorms
✔✔Thunderstorms in exceptional circumstances can occur in a warm front if: - ✔✔the
warm air is convectively unstable.
✔✔Which of the statements is true concerning squall lines ? - ✔✔For severe squall
lines a SIGMET is issued
✔✔During which stage of thunderstorm development are rotor winds characterized by
roll clouds most likely to occur? - ✔✔Mature stage.
✔✔What feature is normally associated with the cumulus stage of a thunderstorm? -
✔✔Continuous updraft
✔✔The initial phase of a thunderstorm is characterized by: - ✔✔continuous updrafts
✔✔Thunderstorms reach their greatest intensity during the: - ✔✔mature stage.
, ✔✔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 at an altitude of its summit. What reading will the aneroid altimeter give,
compared to the summit's elevation? - ✔✔A lower altitude than the elevation of the
summit
✔✔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? - ✔✔None, the reason for the change is that the air around New Orleans is
warmer than the air around Tampa
✔✔How does temperature vary with increasing altitude in the ICAO standard
atmosphere below the tropopause? - ✔✔Decreases
✔✔Which is true of the temperature at the tropopause? - ✔✔It is higher in polar regions
than in equatorial regions
✔✔An isothermal layer is a layer of air in which the temperature - ✔✔remains constant
with height
✔✔The lowest assumed temperature in the International Standard Atmosphere (ISA) is:
- ✔✔-56.5°C
✔✔Refer to the following TAF extract:BECMG 1821 2000 BKN004 PROB30 BECMG
2124 0500 FG VV001What does the abbreviation "VV 001 " mean? - ✔✔Vertical
visibility 100 FT.
✔✔Which of the following statements decodes correctly the following SIGMET:SIGMET
VALID 121420/121820 embd ts obs and fcst in w part of chi fir / mov e / intst nc = -
✔✔Thunderstorms must be expected in the western part of the Chicago FIR. The
thunderstorm zone is moving east. Intensity is constant
✔✔Given the following TAF for Kalamazoo airport:KAZO 281601 14010KT 4SM -RA
SCT025 BECMG 1618 12015G25KT SCT008 BKN013 TEMPO 1823 2SM RA BKN005
OVC010 BECMG 2301 25020KT 5SM BKN020 =If the ETA is 2100 UTC at Kalamazoo,
what is the lowest cloud base forecast for arrival? - ✔✔500 FT
✔✔In the following TAF extract,BECMG 1821 2000 BKN004 PROB30 BECMG 2124
0500 FG VV001What does the abbreviation 'PROB30' mean? - ✔✔30% probability of
the conditions occurring.
✔✔Refer to diagram.
