When cP air moves into western Washington,western Oregon,and California fro the east,the air mass is warmer at the surface than it was originally because the air sinks,is compressed,and warms.

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As cP air moves into the western US from the east, it descends from higher elevations to lower elevations, causing compression. The compression of the air increases its temperature, making it warmer at the surface than it was originally. This is why cP air masses are associated with clear and dry weather conditions in the western US.

When CP Air Moves into Western Washington,western Oregon,and California Fro