3-33.
What determines frontal classification?
1.
Density differences
2.
Temperature differences
3.
Frontal movement
4.
Involved air masses
3-34.
What classification is given to the front that
separates a warm air mass from a retreating
mass of cold air?
1.
Warm
2.
Cold
3.
Quasi-stationary
4.
Occluded
3-35.
What are the primary frontal zones in the
Northern Hemisphere?
1.
Polar and tropical
2.
Polar and arctic
3.
Arctic and tropical
4.
Polar and equatorial
3-36.
Cold air being heavier than warm air will either
underrun the warm air or be overrun by warm
air.
1.
True
2.
False
3-37.
Which of the following statements refer(s) to
frontal slope?
1.
A front’s position along the Earth’s surface
2.
The zone of discontinuity between air
masses
3.
The ratio of a frontal surface’s elevation to
horizontal extent
4.
All of the above
3-38.
Which of the following statements concerning
the relationship between fronts and cyclones
(low-pressure centers) is correct?
1.
All
surface
fronts
develop
a
closed
cyclonic circulation at the surface and aloft
2.
Upper-level cyclones that lower to the
Earth’s surface always contain fronts
3.
Every front is associated with a cyclone
and travels with it
4.
Fronts can occur anywhere but cyclones
cannot
3-39.
What is the average speed of wave cyclones
along the polar front?
1.
10 - 15 knots
2.
15 - 20 knots
3.
20 - 25 knots
4.
25 - 30 knots
3-40.
When is a frontal wave most intense?
1.
When a cyclonic circulation develops
2.
When a cyclonic circulation causes the
cold air to overtake the warm air and forms
an occlusion
3.
When the pressure in the wave cyclone
begins to lower
4.
When the pressure in the wave cyclone
reaches its lowest point
3-41.
When two air masses having different densities
are brought together by the prevailing wind
field, what takes place?
1.
A front forms
2.
There’s a decrease in the temperature
grient
3.
The windflow parallels the isotherms
4.
Each of the above
3-42.
What is cross-isothermal flow?
1.
The flow of wind across isobars
2.
The flow of wind across isotherms
3.
The flow of wind across fronts
4.
A col.
3-43.
Frontogenesis is most likely to occur where
there is a concentration of isotherms and a
circulation that sustains the concentration.
1.
True
2.
False
3-44.
Which of the following statements concerning
frontolytical processes is correct?
1.
They are most effective in the lower layers
of the atmosphere
2.
They
are
more
common
than
frontogenetical processes
3.
They bring about frontal dissipation
4.
Each of the above
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