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Main Ideas in Lab 15 Article (warm front (The two air masses, however, do…
Main Ideas in Lab 15 Article
air masses
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.
can be 1,000 km or more across, several kilo-
meters thick, and extend through 20° or more of latitude.
large body of air that has relatively uniform temperature and moisture conditions at any given altitude.
Polar (P), arctic (A), Tropical (T), Equatorial (E)
cold front
in the Southern Hemisphere a cold front usually causes a shift of wind from the northwest to the southwest.
Before a cold front arrives, the tem-
perature tends to be warm,
The temperature drops suddenly when the front arrives.
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.
warm front
The two air masses, however, do not mix
when they interact with each other.
warm air mass will move over the colder
air mass because it is less dense.
A warm front separates a warm
and humid air mass and a cold and dry air mass.
The boundary between warm and cold air masses, as a
result, tends to resemble a wedge with a gradual slope
15.3). As the warm air mass moves over the mass of cold air, it cools and produces
clouds and light to moderate precipitation over a large area.
stationary fronts
a front that is not moving.
cold and hot air move parallel to the stationary front
tend to be associated with heavy
precipitation at a given location.
clouds
Cirrus clouds often appear 1,000 km or more ahead of the approaching warm front.
Cirrostratus clouds appear as the warm front moves closer.
About 300 km ahead of the warm front, thicker stratus and nimbostratus clouds appear and it begins to rain or snow.