Aviation Weather Exam Questions With All Correct Answers
2025
1. What are the charac- Outward
teristics of the flow Downward
of air around
high pressure Clockwis
systems? e
2. What are the charac- Inward
teristics of the flow Upward
of air around low
pressure Counterclockwise
systems?
3. What is a An elongated area of low pressure.
Trough Line?
(Air rises in this area)
(It is conducive to cloudiness and precipitation)
4. What is a Ridge Line? An elongated area of high pressure.
(Air moving out of a high depletes the quantity of air - therefore
these are areas of descending air.)
(Descending air favors dissipation of cloudiness)
5. What are isobars? Lines on a weather chart which connect areas of equal or constant
barometric
pressure.
6. If isobars are
close together on This shows the steepness of the pressure gradient.
a weather chart • Close = Steep Pressure Gradient = High Wind Speeds
or • Spaced Out = Shallow PG = Low Wind Speeds
a constant
pressure chart
what does this
mean?
7. What causes the
winds aloft to Coriolis Force
flow parallel to
the iso- bars?
1/
16
, Aviation Weather Exam Questions With All Correct Answers
2025
8. What causes surface Surface Friction
winds to
generally flow
across the iso-
bars at an angle?
9. What is the effect
of stable air on Stratiform
clouds?
10. What is the Cumuliform
effect of
unstable air on
clouds?
11. What is the effect Smooth
of stable air on
turbu- lence?
12. What is the effect
of unstable air on Rough
tur- bulence?
13. What is the effect
of stable air on
precipi- tation? Steady
14. What is the effect
of unstable air on
pre- cipitation?
Showery
15. What is the effect
of stable air on
visibili- ty?
Fair to Poor
16. Good
2/
16
, Aviation Weather Exam Questions With All Correct Answers
2025
What is the effect of
unstable air on
visi- bility?
17. At what rate does at- 1in. Hg per 1,000 ft.
mospheric pressure
decrease with an
in- crease in
altitude?
18. How do you deter-
mine the stability By observing the actual lapse rate and comparing it to the standard
of the lapse rate of 3.5° F (2° C) per 1000 ft.
atmosphere? (In general stable air cools at a rate less than the standard lapse rate
with altitude)
The "K" index of a stability chart is the primary means of determining
19. What are the stability.
stages of a
thunderstorm?
1. Cumulus - Updrafts cause raindrops to increase in size
2. Mature - Rain at Earth's surface (it falls through or
immediately beside the updrafts); Lightning; perhaps roll clouds
20. What factors must
be present for 3. Dissipating - Downdrafts and rain begin to dissipate
thun- derstorms to
form? 1. A source of lift (heating, fast-moving front)
2. Unstable Air (nonstandard lapse rate)
21. Is frost considered
hazardous to 3. High Moisture Content (temp. and dew point close)
flight?
Yes.
22. What action (Because it causes friction... The friction interrupts the airflow that
should be taken if generates lift)
you inad- vertently
encounter icing Change course and/or altitude. (Usually, climb to a higher altitude if
conditions? possible)
2025
1. What are the charac- Outward
teristics of the flow Downward
of air around
high pressure Clockwis
systems? e
2. What are the charac- Inward
teristics of the flow Upward
of air around low
pressure Counterclockwise
systems?
3. What is a An elongated area of low pressure.
Trough Line?
(Air rises in this area)
(It is conducive to cloudiness and precipitation)
4. What is a Ridge Line? An elongated area of high pressure.
(Air moving out of a high depletes the quantity of air - therefore
these are areas of descending air.)
(Descending air favors dissipation of cloudiness)
5. What are isobars? Lines on a weather chart which connect areas of equal or constant
barometric
pressure.
6. If isobars are
close together on This shows the steepness of the pressure gradient.
a weather chart • Close = Steep Pressure Gradient = High Wind Speeds
or • Spaced Out = Shallow PG = Low Wind Speeds
a constant
pressure chart
what does this
mean?
7. What causes the
winds aloft to Coriolis Force
flow parallel to
the iso- bars?
1/
16
, Aviation Weather Exam Questions With All Correct Answers
2025
8. What causes surface Surface Friction
winds to
generally flow
across the iso-
bars at an angle?
9. What is the effect
of stable air on Stratiform
clouds?
10. What is the Cumuliform
effect of
unstable air on
clouds?
11. What is the effect Smooth
of stable air on
turbu- lence?
12. What is the effect
of unstable air on Rough
tur- bulence?
13. What is the effect
of stable air on
precipi- tation? Steady
14. What is the effect
of unstable air on
pre- cipitation?
Showery
15. What is the effect
of stable air on
visibili- ty?
Fair to Poor
16. Good
2/
16
, Aviation Weather Exam Questions With All Correct Answers
2025
What is the effect of
unstable air on
visi- bility?
17. At what rate does at- 1in. Hg per 1,000 ft.
mospheric pressure
decrease with an
in- crease in
altitude?
18. How do you deter-
mine the stability By observing the actual lapse rate and comparing it to the standard
of the lapse rate of 3.5° F (2° C) per 1000 ft.
atmosphere? (In general stable air cools at a rate less than the standard lapse rate
with altitude)
The "K" index of a stability chart is the primary means of determining
19. What are the stability.
stages of a
thunderstorm?
1. Cumulus - Updrafts cause raindrops to increase in size
2. Mature - Rain at Earth's surface (it falls through or
immediately beside the updrafts); Lightning; perhaps roll clouds
20. What factors must
be present for 3. Dissipating - Downdrafts and rain begin to dissipate
thun- derstorms to
form? 1. A source of lift (heating, fast-moving front)
2. Unstable Air (nonstandard lapse rate)
21. Is frost considered
hazardous to 3. High Moisture Content (temp. and dew point close)
flight?
Yes.
22. What action (Because it causes friction... The friction interrupts the airflow that
should be taken if generates lift)
you inad- vertently
encounter icing Change course and/or altitude. (Usually, climb to a higher altitude if
conditions? possible)
