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Air Mass

Air Mass. What is an Air Mass?. An air mass is vast pool of air Covers thousands of square kilometers Has the same humidity and temperature characteristics over its horizontal extent Air masses are classified based on the temperature and humidity at their source region.

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Air Mass

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  1. Air Mass

  2. What is an Air Mass? • An air mass is vast pool of air • Covers thousands of square kilometers • Has the same humidity and temperature characteristics over its horizontal extent • Air masses are classified based on the temperature and humidity at their source region

  3. Global Distribution

  4. Classification • 4 zones representing latitude of formation • Equatorial (E) • Tropical (T) • Polar (P) • Arctic or Antarctic (A or AA) • Surface characteristics of source region • Maritime or Oceanic Surfaces (m)which create relatively humid air masses • Continental or Land Surfaces (c)which create relatively dry air masses

  5. Air Masses over North America • Continental Polar (cP) • Originates over high latitude continents (about 60 degrees north) • Cold and dry • Continental Tropical (cT) • Originates over low latitude continents (about 30 north & south) • Warm and dry • Maritime Polar (mP) • Originates over mid to high latitude oceans. • Cool and moist • Maritime Tropical (mT) • Originates over the tropical oceans • Warm and moist

  6. Air Masses over North America

  7. Air Masses over North America

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