Meteorology Reviewer Flashcards
What is the primary cause of all changes in the Earth’s weather?
a. Variations of solar energy at the Earth’s surface.
Where do the maximum winds associated with Jetstream usually occur?
In the vicinity of breaks in the tropopause on the polar side of the jet core.
At lower levels of the atmosphere, friction causes the wind to
flow across isobars into a low because the friction
a. Decreases windspeed and Coriolis force
What feature is associated with a temperature inversion?
A stable layer of air
When does minimum temperature normally occur during a
24-hour period?
after sunrise
Which of the following combinations of weather producing
variables would likely to result in the cumuliform-type clouds,
good visibility, showery precipitation and possible clear-type
icing in the clouds?
a. Unstable, moist air and aerographic lifting
Frontal activity can produce for which is a result of
a. Saturation due to evaporation of precipitation
What are the characteristic of stable air?
a. Poor visibility, steady precipitation and stratus-type clouds
To what does the term “dewpoint” refer to?
a. The temperature at which the evaporation and condensation
points is equal
What term describes an elongated area of low pressures?
a. Trough.
What is an indication that downdrafts have developed and the thunderstorm cell has entered mature stage?
a. Precipatation begins to fall from the cloud base
Which terrain permits the greatest temperature change?
a. Arid, barren surface
Where is the normal location of the Jetstream relative to
surface lows and fronts?
a. The Jetstream is located north of the surface systems
Clouds are divided into four (4) families according to their
a. Height range
When will frost most likely form on aircraft surfaces?
a. On clear nights with stable air and light winds
Which weather condition is an example of a nonfrontal
instability band?
a. Squall line
Which thurnderstorms generally produce the most severe
conditions such as heavy hail and destructive winds?
b. Squall line thunderstorms
Which weather condition is defined as an anticyclone?
b. High pressure area
Which area or areas of the Northern Hemisphere experience
a generally east to west movement of weather systems?
b. Arctic and subtropical
Which feature is associated with the tropopause?
b. Abrupt change of temperature lapse rate
In the middle latitude, the range of bases for the middle
cloud is
b. 6,500 to 23,000 feet
In which meteorological conditions can frontal waves and
low pressure areas form?
b. Slow moving cold fronts or stationary fronts.
What type of clouds can be expected when an unstable air
mass is forced to ascend a mountain slope?
b. Clouds with extensive vertical development
What type of weather change is to be expected in an area
where frontolysis is reported?
b. The front is dissipating.
What determines the type of structural icing that form on the
surface of an aircraft?
b. Size of the water droplets and outside air temperature
What is a feature if supercooled water?
b. The unstable water drop freezes upon striking an exposed
object
Where do maximum winds associated with the jetstream
usually occur?
b. In the vicinity of breaks in the tropopause on the polar side
of the jet core.
Variations in altimeter settings between weather reporting
stations are caused by
b. Restrictions to air mass movement caused by natural terrain
barriers
Which weather phenomenon is always associated with the
passage of frontal system?
b. Change in wind direction
Freezing rain encountered during climb is normally evidence
that
b. a layer of warmer air exist above
Which type precipitation is an indication that supercooled
water is present?
a. Wet snow
What is the characteristic of the troposphere?
b. There is an overall decrease of temperature with an increase
of altitude
What weather difference is found on each side of a “dry
line”?
b. Dewpoint difference
What condition is indicated when ice pellets are
encountered during flight?
b. Freezing rain at higher levels
Freezing rain encountered during climb is normally evidence
that
b. a layer of warmer air exists above
Which weather phenomenon signals the beginning of the
mature stage of a thunderstorm?
b. The start of rain at the surface.
Which type frontal system is normally crossed by the
Jetstream?
c. Occluded front
Where is the usual location of the thermal low?
c. Over the surface of a dry, sunny region
Which type wind flows downslope becoming warmer and
dryer?
c. Katabatic wind
When will frost most likely form on aircraft surfaces?
c. On clear nights with stable air and light winds.
What condition is necessary for the formation of structural
icing in flight?
c. Visible water.
What characterizes a ground-based inversion?
c. Poor visibility
Where is the usual location of thermal low?
c. Over the surface of a dry, sunny region.
Which event usually occurs after an aircraft passes through
a front into the colder air?
c. Atmospheric pressure increases.
Which feature is associated with the tropopause?
c. Abrupt change of temperature lapse rate.
Which type of clouds may be associated with the Jetstream?
c. Cirrostratus cloud band on the polar side and under Jetstream.
What conditions are necessary for the formation of thunderstorms?
c. Lifting force, high humidity and unstable condition
What is the feature of a stationary front?
c. Surface winds tends to flow parallel to the frontal zone.
The localities in which radiation fog would most likely to occur are…
c. Level inland areas
A clear area in a line of thunderstorm echoes on a radar scope indicates
c. An area where precipitation drops are not detected.
What is the characteristic of a troposphere?
c. There is an overall decrease of temperature with an increase of altitude
Which of the following is a high cloud
c. Cirrostratus
The start of rain:
Thunderstorm mature stage
