Air Mass is an extremely large body of air whose properties of temperature and moisture content (humidity), at any given altitude, are fairly similar in any horizontal direction.
- can cover hundreds of thousands of square miles.
- there can be small variations
Source Regions are simply geographic areas where an air mass originates. Should be:
- uniform surface composition – flat
- light surface winds
The longer the air mass stays over its source region, the more likely it will acquire the properties of the surface below.
Classification: 4 general air mass classifications categorized according to the source region.
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