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Air Masses:

Air Masses:. large bodies of air that have homogeneous. air masses form in areas of where they can remain long enough to acquire the conditions of that region. winter air mass patterns for North America. summer air mass patterns for North America. cP air masses

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Air Masses:

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  1. Air Masses: • large bodies of air • that have • homogeneous • air masses form • in areas of • where they • can remain long • enough to acquire • the conditions of that • region

  2. winter air mass patterns • for North America • summer air mass patterns • for North America

  3. cP air masses • are associated with • frigid winter temps. • that affect the BBC Canada

  4. typical weather map showing eastern 2/3 of North America • dominated by a cP air mass

  5. July and January rainfall patterns; can you see the influence • of on rainfall patterns in North America January

  6. air mass symbols k and w are added when an air mass • moves over a surface that is different from its source region kolder warmer warmer colder the surface it is passing over—often leads to instability the surface it passes over—may lead to stability, inversions, and fog

  7. e.g. encounter a relatively warmer land surface and become unstable (modified to mTk)

  8. SUMMER unstable mTk mT (hot) (cool) Gulf of Mexico North America

  9. unstable mT air • masses are modified • to mTk over the • SE US and become • even more unstable

  10. WINTER mTw mT advection fog (cold) (warm) Gulf of Mexico North America

  11. Days with fog moving inland and may produce advection fog

  12. another example of air mass modification is when • cP air masses pass over the relatively

  13. “Lake effect snow”

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