Week 12 Quiz
Air Masses and Fronts

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This is the quiz for week 12. You are expected to do your own work, but you may use class reference material. 

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Section 1 -- True False

Choose true or false for each question by clicking the correct button.

#1. The middle latitudes are generally good source regions.

True False #2. Cumuliform clouds are often associated with passing cold fronts. True False #3. Stratiform clouds are usually associated with approaching warm fronts. True False #4. Occluded fronts are associated with active weather systems and storm formation. True False #5. Stability is enhanced when an air mass is colder than the surface over which is is moving. True False #6. Air masses from the same source region will have the same properties all of the time. True False   Section 2 -- Matching

Type the correct letter in the box for each question.

Word List
a. stationary front f. cold occlusion
b. mT g. warm occlusion
c. overrunning h. occluded front
d. cP i. warm front
e. frontolysis j. cold front
1.  Identified by a sudden drop in temperature, barometric pressure, and dew point, a wind shift from SSW to WNW, and increasing visibility.
2.  Identified by an increase in temperature and dew point, a wind shift from SSE to SSW, and decreasing visibility.
3.  Identified by a dip followed by a rise in barometric pressure, steadily dropping temperatures, and showers.
4.  Responsible for lake effect snows.
5.  Very common type of front in the Pacific coastal states.
6.  Leads to a very stable atmosphere.
7.  Very common in eastern Washington and Oregon.
8.  The air mass responsible for the high humidity of the Gulf coast states.
9.  This frontal system is often found near some topographic barrier, such as the Rocky Mountains.
10.  A weakening front.

Section 3 --  Completion

Type the correct word in each of the boxes provided.

1. A(n)  in dew point is characteristic of a passing cold front.
2. A front is a boundary between air masses of different .
3.  move very fast and have steep slopes.
4.  determine the trajectory of air masses.

Section 4 -- Multiple Choice

Type the correct letter in the box for each question.

1.  Cold fronts are characterized by:

2.  Warm fronts are characterized by: 3.  Most frontal systems over the U.S. move from: 4.  An increase in temperature contrast across a front leads to: 5.  A wintertime cP air mass over north america is most likely associated with:

        a. cold, dry, stable air.
        b. cool, moist, unstable air.
        c. Lake -effect snows in the midwest.
        d. a & c.

6.  In meteorology, a source region is:

        a. incontinence.
        b. a large, homogeneous region where air masses originate and acquire their properties of  temperature and humidity.
        c. the base of a cloud deck.
        d. b & c.

7.  A cold occlusion refers to:

        a. cold air overtaking very cold air.
        b. a sinus problem.
        c. cool air overtaking cold air.
        d. very cold air overtaking cold air.

8.  Frontolysis is:

        a. a weakening of a front.
        b. a strengthening of a front.
        c. electronic hair removal.
        d. the movement of a front.

Short Answer/Essay

Why does the same cold front typically produce more rain over Kentucky than Kansas?

In no less than 100 words explain why are the western Cascades extremely wet while the eastern Cascades are extremely dry.

What might be the likely cause of a local scale, variable, gusty wind on a blustery spring day in eastern Idaho?

Explain why freezing rain more commonly occurs with warm fronts than with cold fronts.

Can you identify the air masses (and their source regions) that influence the weather in the continental U.S?

End of quiz questions.


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