True (A) or False (B) Statements 2. A stationary front does not move because the

Question

True (A) or False (B) Statements
2. A stationary front does not move because the winds blow parallel to the front.
3. The cT air mass of North America favors the development of droughts.
4. During spring, mP air mass would most likely bring record-breaking high temperatures to the eastern
half of the United States.
5. The persistent, hot, humid weather that lasts many days in the southeastern United States could be
classified as air mass weather.   
6. The rising of warm air up and over cold air is called overrunning.
7. The origin of cP and cA air masses that enter the United States is northern Siberia.
8. Compared to an mP air mass, mT air is colder and drier.
9. During the winter, an air mass that moves into coastal sections of Oregon and Washington from
the northwest would most likely be maritime Polar.
10. A dryline is a stalled cold front.
11. Clear sunny days with very cold nights would be associated with a cP air mass.
12. Fronts are associated with high pressure.

Explanation / Answer

2. (A) TRUE

Explanation :A stationary front exhibits no lateral movement but the winds blow parallely in opposite directions on either side of the front.

3. (A) TRUE.

Explanation : The cT or continental tropical air masses are very hot and dry because of the lack of vegetation and the hot surface temperatures. They typically develop over tropical and subtropical desert areas during the hot summer months. Stagnant cT air masses are associated with droughts.

4. (B) FALSE.

Explanation : During spring, mT air mass would most likely bring record breaking high-temperatures to the eastern half of the United States.

5. (B) FALSE.

Explanation : The persistent, hot, humid weather that lasts many days in the southeastern United States could be classified as mT(maritime Tropical) air mass weather. This air mass is a factor in the formation of thunderstorms and convective precipitation as it has high temperature and hugh moisture content.

6. (A) TRUE.

Explanation : Overrunning is the condition that develops when a warm air rises up over a mass of cold air.

7. (B) FALSE.

Explanation : The origin of the cP and cA air masses that enter the United States is Northern Canada and Alaska because they develop over the ice and snow covered regions of the Arctic, Northern Canada and Alaska where the long and clear nights allow for strong radiation cooling.

8. (B) FALSE.

Explanation : Compared to an mP air mass, mT air is warmer and moist because mT air masses are moist and tropical and are usually warmer than the surface over which it is moving.

9. (A) TRUE.

Explanation : maritime Polar(mP) air masses are cool and moist which moves into the coastal sections of Oregon and Washington, during the winter, from the north west.

10. (B) FALSE.

Explanation : A dryline is a dewpoint front. It is the boundary marking a strong horizontal change in the atmospheric pressure.

11. (A) TRUE.

Explanation : cP or Continental Polar air masses are the coldest of all air masses and they are dry. Thus clear sunny days with very cold nights would be associated with a cP air mass.

12. (B) FALSE.

Explanation : Fronts are associated with low pressure.

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