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In a mid-latitude cyclone,an upper-level pool of cold air that has broken away from the main flow is called a​


A) cut-off low.
B) shortwave.
C) ​wave cyclone.
D) ​lee-side low.
E) ​jet streak.

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

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The planetary vorticity of an air parcel moving from low toward high latitude in the Northern Hemisphere will​


A) increase.
B) decrease.
C) ​remain constant.
D) ​change from positive to negative.
E) ​change from negative to positive.

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

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When an upper-level low lies directly above a surface low,


A) the surface low will probably weaken.
B) thunderstorms will develop.
C) ​a wave cyclone will begin to form.
D) ​the pressure of the surface low will decrease.
E) ​cyclogenesis will occur.

F) B) and D)
G) A) and B)

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Jet streaks often occur away from jet streams.​

A) True
B) False

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Divergence and convergence of air are due to changes in


A) cloud pattern.
B) solar radiation.
C) ​radiational cooling.
D) ​precipitation type.
E) ​wind speed or wind direction.

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

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When a shortwave disturbs a longwave trough that lies parallel to and directly above a stationary front,the rising of warm air and the sinking of cold air establishes a condition known as ____________________.​

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​baroclini...

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An upper-level trough that shows retrograde motion would be moving toward the​


A) west.
B) east.
C) ​north.
D) ​south.
E) ​northeast.

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

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Vorticity refers to the​


A) rising and sinking of air along weather fronts.
B) formation of clouds.
C) ​spin of air parcels.
D) ​changing of the seasons.
E) ​development of a wave cyclone.

F) A) and E)
G) C) and D)

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Vorticity is always present in the atmosphere,even during fair weather.​

A) True
B) False

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If we assume that the absolute vorticity of flowing air is conserved,air moving northeastward will bend ____ to compensate for the ____ in Earth's vorticity.​


A) anticyclonically;decrease
B) anticyclonically;increase
C) ​cyclonically;increase
D) ​cyclonically;decrease
E) ​cyclonically;lack of change

F) B) and C)
G) All of the above

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List the mechanisms that provide energy for a cyclone.​

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​Energy for the storm is derived from se...

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Where maritime arctic air and colder continental arctic air meet,the boundary separating them is called a(n)____________________.​​

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The development of a mid-latitude cyclone,according to the Norwegian model,begins along the​


A) conveyor belt.
B) wave cyclone.
C) ​cyclone.
D) ​incipient cyclone.
E) ​anticyclone.

F) C) and D)
G) A) and C)

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The polar jet stream removes air above the surface cyclone and supplies air to the surface anticyclone.​

A) True
B) False

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If the flow of air into a surface low pressure area is greater than the divergence of air aloft,the surface pressure in the center of the low will​


A) increase.
B) decrease.
C) ​remain the same.
D) ​deepen.
E) ​drop rapidly.

F) A) and B)
G) B) and D)

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Cyclones that normally move northeastward along the Atlantic Coast,bringing high winds and heavy snow or rain to coastal areas,are referred to as ____________________.

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northeaste...

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On a surface weather map that shows an open wave cyclone,the warm sector can be observed​


A) between the cold and warm fronts.
B) behind an advancing cold front.
C) ​ahead of an advancing cold-occluded front.
D) ​behind an advancing cold-occluded front.
E) ​ahead of an advancing warm front.

F) B) and D)
G) A) and E)

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Atmospheric shortwaves usually move ____ longwaves,and ____ when they move through a longwave ridge.​


A) faster than;weaken
B) faster than;strengthen
C) ​slower than;weaken
D) ​slower than;strengthen
E) ​at the same speed as;weaken

F) D) and E)
G) A) and B)

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Rossby waves are also known as


A) stable waves.
B) shortwaves.
C) ​tidal waves.
D) ​longwaves.
E) ​macrowaves.

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

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Like hurricanes,polar lows have a clear area in their center.​

A) True
B) False

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