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Weather Content From Lab 15 (Classification of Air Masses (Tropical air…
Weather Content From Lab 15
Air Masses
The definition of an air mass is a large body of air that has relatively uniform temperature and moisture
conditions at any given altitude.
Air masses form when a portion of the air in the lower atmosphere stays over a relatively uniform region of Earth’s surface.
Classification of Air Masses
Tropical air masses originate in low latitudes and produce warm temperatures.
Continental air masses originate in low latitudes and produce warm temperatures.
Polar air masses originate in high latitudes near Earth's poles and produce colder temperatures.
Arctic air masses originate in high latitudes near Earth's poles and produce colder temperatures.
Fronts
Stationary Fronts
There is heavy precipitation
A stationary front is a front that's not moving
Temperature doesn't change since the cold and warm fronts are parallel to each other
Low pressure
The front is not moving
Lots of changes in the wind
Cold Fronts
Light patchy rain or powerful thunderstorms
When the front arrives the temperature drops
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.
A cold front occurs when a cold air mass moves into an area that was previously occupied by a warm air mass
Wind gusts that shift directions
Atmospheric pressure increases
Warm Fronts
Extended periods of precipitation and light precipitation or no precipitation at all
The temperature increases
Warm air mass will move over the colder
air mass because it is less dense
A warm front occurs when a warm air mass
moves into an area that was occupied by a cold air mass
Wind can change directions
The pressure rises