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Exam 8: Air Pressure and Winds

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Question 1

Multiple Choice

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The winds aloft in the middle latitudes of the Southern Hemisphere generally blow​

A) ​from west to east.
B) ​from east to west.
C) ​from north to south.
D) ​from south to north.
E) ​in any of the above directions.

F) C) and D)
G) B) and D)

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Question 2

Multiple Choice

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The unit of pressure designated by the International System (SI) of measurement is the ____.​

A) ​atmospheric pressure
B) ​millibar
C) ​bar
D) ​torr
E) ​pascal

F) None of the above
G) A) and E)

Correct Answer

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E

Question 3

Multiple Choice

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The contour lines drawn on a 500 mb chart are lines of constant​

Zonal flow wind-flow patterns are associated with​

Because of friction, surface winds move ____ winds aloft with the same pressure gradient.​

​100 pascals equals 10 millibar.

A pascal (Pa) is the force of ____ acting on a surface area of ____.​

The Coriolis force deflects winds to the ____________________ in the Northern Hemisphere and to the ____________________ in the Southern Hemisphere.​

Net convergence of air would cause surface pressure to ____ and net divergence would cause surface pressure to ____.​

According to Newton's second law, an object will always accelerate in the direction of the total force acting on it. Therefore, to determine in which direction the wind will blow, we must identify and examine all of the forces that affect the horizontal movement of air. These forces are the ____________________ force, the ____________________ force, and the Coriolis force.

​The pressure gradient force is non-existent at the equator.

Which of the following instruments measures pressure?​

Air moves in response to pressure differences. Because air pressure decreases rapidly with increasing height above the surface, there is always a strong pressure gradient force directed upward, much stronger than in the horizontal. Why, then, doesn't the air rush off into space?

The pressure announced on last night's television weather broadcast was 29.92. Explain how this was measured and give the units. Would this be considered an unusually large or low pressure value?

Because lows are also known as cyclones, the flow of air around them is often called ____________________.

The pressure gradient force is directed from higher pressure toward lower pressure​

What is considered standard sea-level atmospheric pressure in millibars?​

Another term for isobaric chart is ____________________.

​The pressure gradient force has a direct effect on horizontal wind movements.

​In the Northern Hemisphere, the average height of contour lines on an upper-level isobaric chart tend to decrease northward.