AVSC 1100 CHAPTER 7 QUESTIONS AND VERIFIED
ANSWERS
Every physical process of weather is accompanied by, or is the result of, a
movement of air.
pressure differential.
heat exchange. - Answers - heat exchange.
What causes variations in altimeter settings between weather reporting points?
Unequal heating of the Earth's surface.
Variation of terrain elevation.
Coriolis force. - Answers - Unequal heating of the Earth's surface.
The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This
difference in direction is primarily due to
stronger pressure gradient at higher altitudes.
friction between the wind and the surface.
stronger Coriolis force at the surface. - Answers - friction between the wind and the
surface
The development of thermals depends upon
a counterclockwise circulation of air.
temperature inversions.
solar heating. - Answers - solar heating.
Convective circulation patterns associated with sea breezes are caused by
warm, dense air moving inland from over the water.
water absorbing and radiating heat faster than the land.
cool, dense air moving inland from over the water. - Answers - cool, dense air moving
inland from over the water.
The boundary between two different air masses is referred to as a
A. frontolysis.
B. frontogenesis.
C. front. - Answers - C. front.
One weather phenomenon which will always occur when flying across a front is a
change in the
wind direction.
, type of precipitation.
stability of the air mass. - Answers - wind direction.
One of the most easily recognized discontinuities across a front is
A. a change in temperature.
B. an increase in cloud coverage.
C. an increase in relative humidity. - Answers - a change in temperature.
If there is thunderstorm activity in the vicinity of an airport at which you plan to land,
which hazardous atmospheric phenomenon might be
expected on the landing approach?
Precipitation static.
Wind-shear turbulence.
Steady rain. - Answers - Wind-shear turbulence.
A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold
front is known as a
prefrontal system.
squall line.
dry line. - Answers - squall line.
What conditions are necessary for the formation of thunderstorms?
High humidity, lifting force, and unstable conditions.
High humidity, high temperature, and cumulus clouds.
Lifting force, moist air, and extensive cloud cover. - Answers - High humidity, lifting
force, and unstable conditions.
During the life cycle of a thunderstorm, which
stage is characterized predominately by downdrafts?
Cumulus.
Dissipating.
Mature. - Answers - Dissipating.
Thunderstorms reach their greatest intensity during the
mature stage.
downdraft stage.
cumulus stage. - Answers - mature stage.
What feature is normally associated with the cumulus stage of a thunderstorm?
Roll cloud.
Continuous updraft.
Frequent lightning. - Answers - Continuous updraft.
ANSWERS
Every physical process of weather is accompanied by, or is the result of, a
movement of air.
pressure differential.
heat exchange. - Answers - heat exchange.
What causes variations in altimeter settings between weather reporting points?
Unequal heating of the Earth's surface.
Variation of terrain elevation.
Coriolis force. - Answers - Unequal heating of the Earth's surface.
The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This
difference in direction is primarily due to
stronger pressure gradient at higher altitudes.
friction between the wind and the surface.
stronger Coriolis force at the surface. - Answers - friction between the wind and the
surface
The development of thermals depends upon
a counterclockwise circulation of air.
temperature inversions.
solar heating. - Answers - solar heating.
Convective circulation patterns associated with sea breezes are caused by
warm, dense air moving inland from over the water.
water absorbing and radiating heat faster than the land.
cool, dense air moving inland from over the water. - Answers - cool, dense air moving
inland from over the water.
The boundary between two different air masses is referred to as a
A. frontolysis.
B. frontogenesis.
C. front. - Answers - C. front.
One weather phenomenon which will always occur when flying across a front is a
change in the
wind direction.
, type of precipitation.
stability of the air mass. - Answers - wind direction.
One of the most easily recognized discontinuities across a front is
A. a change in temperature.
B. an increase in cloud coverage.
C. an increase in relative humidity. - Answers - a change in temperature.
If there is thunderstorm activity in the vicinity of an airport at which you plan to land,
which hazardous atmospheric phenomenon might be
expected on the landing approach?
Precipitation static.
Wind-shear turbulence.
Steady rain. - Answers - Wind-shear turbulence.
A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold
front is known as a
prefrontal system.
squall line.
dry line. - Answers - squall line.
What conditions are necessary for the formation of thunderstorms?
High humidity, lifting force, and unstable conditions.
High humidity, high temperature, and cumulus clouds.
Lifting force, moist air, and extensive cloud cover. - Answers - High humidity, lifting
force, and unstable conditions.
During the life cycle of a thunderstorm, which
stage is characterized predominately by downdrafts?
Cumulus.
Dissipating.
Mature. - Answers - Dissipating.
Thunderstorms reach their greatest intensity during the
mature stage.
downdraft stage.
cumulus stage. - Answers - mature stage.
What feature is normally associated with the cumulus stage of a thunderstorm?
Roll cloud.
Continuous updraft.
Frequent lightning. - Answers - Continuous updraft.
