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Air Masses and Weather
• An air mass is a large body of air in the lower
troposphere that has similar characteristics
throughout.
– Can be several kilometers in diameter and several
kilometers high.
– The temperature and humidity for the air mass depends
on where it originates and when it moves it takes the
characteristics from its origin with it.
– As air masses travel, there characteristics can change
based where it has traveled to and how long it sits in the
new location.
– Earth’s topography can also contribute to changes in the
temperature and humidity of an air mass as it travels.
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