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Exam 11: Air Masses and Fronts

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Question 21

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In winter, which sequence of clouds would you most likely expect to observe as a warm front with precipitation approaches your location?

A) ​cirrus, nimbostratus, altostratus, and cumulonimbus
B) ​cirrus, cirrostratus, altostratus, and nimbostratus
C) ​cirrostratus, nimbostratus, altostratus, and fog
D) ​cirrus, cirrostratus, altostratus, and cumulonimbus
E) ​altostratus, cirrostratus, cirrus, and nimbostratus

F) A) and B)
G) C) and E)

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Question 22

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Air masses are grouped into five general categories according to their ____________________.

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Question 23

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A good air mass source region is generally flat and of uniform composition with light surface winds.

Drylines may be detected by Doppler radar when insects and insect-eating birds congregate along it. On the radar screen, the echo from insects and birds shows up as a thin line, called a fine line.

​Maritime polar air masses along the East Coast of the United States are usually ____________________ than those along the nation's West Coast.

The lake effect occurs when a(n) ____ air mass moves over a ____ body of water.

Compared to an mP air mass, mT air is

How do upper-air fronts form?​

Before the passage of a cold front the pressure normally ____, and after the passage of a cold front the pressure normally ____.

A(n) ____________________ is an extremely large body of air whose properties of temperature and humidity are fairly similar in any horizontal direction at any given altitude.

A front is the transition zone between two air masses of different​

Maritime Tropical (mT) air masses are responsible for daily afternoon thunderstorms along the Gulf Coast.

Barometric pressure usually falls with the approach of a(n) ____________________ front or ____________________ front.​

Cold fronts are colored purple on a weather map.

Occluded fronts may form when

Describe the characteristics of an atypical cold front.​

Explain how, using no meteorological instruments other than your eyes, you could identify the passage of an occluded front.​

You are in upstate New York and observe the wind shift from easterly to southerly. This shift in wind is accompanied by a sudden rise in both the air temperature and dew-point temperature. This means a(n) ____ front passed.

Explain how the airflow aloft regulates the movement of air masses.​

Occluded fronts are often associated with a broad band of precipitation