True (A) or False (B) Statements 2.A stationary front does not move because the
ID: 108890 • Letter: T
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 easternhalf 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
A stationary front is the boundary between two different air masses with different densities when neither is advancing. The air masses are not moving strongly enough to overtake each other, so the front remains in one place. Winds along a stationary front are usually parallel to the front blowing in opposite directions on either side which is one reason why the front does not move. Stationary fronts essentially have no surface movement, or very slow movement of less than 5 mph at the surface. However, warm air from the warm air mass can still be moving over the top of the colder air farther up in the atmosphere.
When one of the air masses moves into the other air mass, the stationary front will begin to move. When this transition occurs, the front will then either be classified as a warm front or a cold front, depending on which air mass is pushing ahead.
Along some stationary fronts, the weather is clear to partly cloudy. If both of the air masses are relatively dry, then no precipitation will fall. However, in some stationary fronts where there is a lot of water vapor in the warmer air mass, significant rain or freezing rain can occur. Some of the worst ice storms and flooding in the Southeast occur in these conditions because rain falls continuously over an area for several days as the front stays in one place.
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