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22 Cards in this Set
- Front
- Back
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A good source region for an air mass would be |
generally flat areas of uniform composition with light surface winds
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Which of the following statements is most plausible? |
In winter, cA source regions have lower temperatures than cP source regions.
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Which air mass would show the most dramatic change in both temperature and moisture content as it movesover a large body of very warm water?
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cP in winter
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The coldest of all air masses is |
cA.
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What type of air mass would be responsible for refreshing cool, dry breezes after a long summer hot spell in theCentral Plains? |
cP
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Clear sunny days with very cold nights would be associated with what type of air mass? |
cP
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Cumuliform cloud development would be most likely in which of the following? |
cP air mass moving over warm water
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Wintertime mP air masses are less common along the Atlantic coast of North America than along the Pacificcoast mainly because |
the prevailing winds aloft are westerly.
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The designation for a cool, moist air mass is |
mP
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An mT air mass lying above a cold ground surface represents a(n) ____ situation |
stable
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Along the boundary between continental polar and maritime tropical air masses, ____ is often found |
widespread precipitation and storminess
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The only indication on the station model of past weather conditions is the |
pressure tendency.
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A dryline is |
both a dew point front and a boundary marking a strong horizontal change in atmosphericmoisture.
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Alternating lines of blue and red on a surface weather chart indicate |
a stationary front.
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According to the model of the life cycle of a wave cyclone, the storm system is normally most intense |
when the system first becomes occluded.
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The piling up of air above a region is called |
convergence
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Cyclogenesis is the __ of a mid-latitude cyclone |
development or strengthening |
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In the southern hemisphere, convergence and divergence don't play a role in development of middle latitude cyclones. |
false. |
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When an upper-level low lies directly above a surface low, |
the surface low will probably weaken |
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jet streaks often occur away from jet streams |
false |
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When upper-level divergence of air above a surface low area is stronger than the convergence of surface air, the surface pressure will __ and the storm itself will. |
decrease, intensify |
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On an upper-level chart where the isotherms cross the isobars (or contours) and temperature advection occurs, the atmosphere is called |
baroclinic |
