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Meteorology > 8 > Flashcards

8 Flashcards

1
Q

T/F: we can generally expect the air to be rising above areas of surface low pressure and sinking above areas of surface high pressure.

A

‘True

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2
Q

Surface winds move ________ From the center of a high pressure area

A

Outward (diverges)

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3
Q

T/F: Air pressure decreases with height more rapidly in warm air than cold air

A

False

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4
Q

Which force acts at a 90 degree angle to the wind?

A

Coriolis force

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5
Q

What is generally associated with troughs on an upper level iso basic chart?

A

Low pressure center

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6
Q

Another term for isobaric charts is?

A

Constant pressure chart

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7
Q

A station at an altitude of 900mb (about 3,000 ft) above sea level measure, with an air pressure of 930 mb would have a sea level pressure of?

A

1020 mb

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8
Q

If upper-level divergence exceeds surface convergence, the air pressure at the center of the surface low will _____?

A

Decrease

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9
Q

On an isobaric surface, pressure is ____?

A

Constant

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10
Q

What pressure variation cause air to move from areas of high pressure to areas of low pressure

A

Horizontal pressure variations

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11
Q

What is the angle at which surface winds cross isobars?

A

A large degree dependent on the roughness of the terrain

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12
Q

The magnitude of the coriolis force varies with wind speed and?

A

And latitude

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13
Q

T/F: the Coriolis force is the force that causes wind to blow

A

FALSE

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14
Q

T/F: The pressure gradient force is non-existent at the equator

A

False

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15
Q

The change in _____ that occurs over a given horizontal distance is called the pressure gradient

A

amount of pressure change

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16
Q

The pressure gradient force is directed from higher pressure towards lower pressure at?

A

All places on earth

17
Q

A geostrophic wind is a wind that results from a balance between what two forces?

A

The Coriolis force and the pressure gradient force

18
Q

What is considered to be standard sea-level atmospheric pressure (in mb)

A

1013.25 mb

19
Q

What is the theoretical wind that would result from an exact balance between the Coriolis force and the pressure gradient force ?

A

Geostrophic flow

20
Q

Surface winds that blow across isobars at an angle and the pressure gradient force is balanced by the ______ force and the Coriolis force.

A

Frictional force

21
Q

What does a ridge indicate on an isobaric chart?

A

indicates higher than average heights

22
Q

T/F: an altimeter measures altitude but is calibrated to indicate pressure?

A

FALSE

23
Q

Which of the following produces the strongest Coriolis force?

A

Fast winds and High latitude

24
Q

The pressure gradient force has a direct effect on ?

A

Horizontal wind movements

25
Q

The surface pressure at the bases of warm and cold columns of air are equal. Air pressure in the warm column of air will _______ with increasing height _____________ in the cold column

A

Decrease, More slowly than,

26
Q

T/F: Net convergence of air would cause surface pressure to increase and net divergence would cause surface pressure to decrease.

A

True

27
Q

Isobaric surfaces are higher or lower in less dense, warm air? Higher or lower in cold more dense air?

A

Higher, lower

28
Q

What causes surface winds to move more slowly than winds aloft with the same pressure gradient.

A

Friction

29
Q

The Coriolis force is a ________ force created by earths rotation

A

Apparent force

30
Q

Upper level winds in the middle latitudes of both hemispheres generally blow from the?

A

West

31
Q

T/F: because lows are also known as cyclones, the flow of air around them is often called anticyclonic flow

A

FALSE

32
Q

The force that would cause a stationary parcel of air to begin to move horizontally is called?

A

The pressure gradient force

33
Q

On a 500 mb chart, contour lines are drawn to represent horizontal changes in ________, which corresponds to horizontal changes in ________.

A

Altitude, pressure

34
Q

Warm air aloft is associated with constant pressure surfaces that are found at higher latitudes than normal and higher than normal atmospheric ______ aloft

A

Pressure

35
Q

Millibars and hectopascal are commonly found on a surface weather map and are both units of what?

A

Pressure

36
Q

A rapid change in pressure over a relatively short distance is called?

A

A steep pressure gradient

37
Q

The wind around a surface high pressure center in the northern hemisphere blows ______ and outward from the center

A

Clockwise

38
Q

In the middle latitudes, when an area of higher pressure approaches a city, surface pressure usually ____ when it moves away. Pressure usually _______.

A

Rises,Rises

Meteorology (8 decks)

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