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Info on Weather fronts, and air masses (Classification of air masses…
Info on Weather fronts, and air masses
Fronts
Cold Fronts
The temperature drops suddenly when the front arrives. In addition, the atmospheric pressure will start to increase, there tend to be wind gusts that shift directions, and there is a sudden drop in the dew point.
In the Northern Hemisphere, a cold front usually causes a shift of wind from the southwest to the northwest, whereas in the Southern Hemisphere a cold front usually causes a shift of wind from the northwest to the southwest.
Depending on the amount of moisture in the air and the speed of the cold front, the amount of precipitation can range from light to heavy. Cold fronts often produce powerful thunderstorms in the summer months.
Cold fronts tend to move much faster than warm fronts. The cold air mass will push under the warm air mass as it moves because the cold air mass is denser than the warm air mass
Before a cold front arrives, the temperature tends to be warm, atmospheric pressure begins to decrease, there is often some light patchy rain, and the dew point is high and steady.
a cold front occurs when a cold air mass moves into an area that was previously occupied by a warm air mass.
Warm Fronts
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Warm fronts, however, will sometimes produce thunderstorms. This occurs when the overrunning warm air is humid and unstable and the temperature difference on the opposite sides of the air mass boundary is large. At the other extreme, a warm front associated with a dry and stable air mass will produce no precipitation at all.
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A warm front separates a warm and humid air mass and a cold and dry air mass. The two air masses, however, do not mix when they interact with each other. Instead, the warm air mass will move over the colder air mass because it is less dense.
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Stationary Fronts
a stationary front is found in an area where a warm air mass and a cold air mass move past each other.
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Air Masses
Formation
An air mass forms when a portion of the air in the lower atmosphere stays over a relatively uniform region of Earth’s surface, such as a large body of water, for several days, because the air tends to assume the temperature and moisture conditions of the region beneath it.
What are air masses
They are large bodies of air that has relatively uniform temp and moisture conditions at any given altitude
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