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Exam 12: Middle Latitude Cyclones

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Question 21

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In polar front theory, the region of warm air between the cold and warm fronts is known as the ____________________.

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Question 22

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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

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Question 23

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Like hurricanes, polar lows normally have a warmer central core, strong winds (often gale force or higher), and heavy showery precipitation that unlike a hurricane, is in the form of snow.​

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

Explain the term absolute vorticity in a real-life context, such as a spinning ice skater. In your description, include the terms relative vorticity and Earth's vorticity.​

​Divergence and convergence of air are due to changes in

A small, moving disturbance imbedded in a longwave is called a​

Generally, polar lows rapidly ____ when they move over land.​

Which name is given to a large cyclonic storm system that forms in the middle latitudes?​

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

Storms typically form along the polar front. However, there are also storms that develop over polar water behind (or poleward of) the main polar front.​

Cyclogenesis can occur in regions without a large horizontal temperature gradient.​

During the March, 1993 storm off the coast of Texas, a region of ____ air in the upper air above the storm caused the rapid decrease of surface pressure leading to the development of a wave cyclone.​

What does cyclogenesis mean, and where does it commonly occur?​

Why does middle latitude storm development occur beneath troughs rather than ridges on a 500 mb chart?​

​Define the conditions under which cyclones would die out soon after they form.

Jet streaks often occur away from jet streams.​

Why is it important to locate and follow the movements of atmospheric shortwaves?​

In a mid-latitude cyclone, when the upper low lies directly above the surface low, the storm system is said to be​

During baroclinic instability, a ____________________ lows often appear as single contour lines on an upper-level chart.