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Air mass
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Explore what happens when cold and warm air masses collide
World map showing the principal global air masses, each outlined and labeled with abbreviations. Continental Arctic (cA) and continental Antarctic (cAA) air masses are shown over the Arctic and Antarctic regions. Continental polar (cP), maritime polar (mP), continental tropical (cT), maritime tropical (mT), and maritime equatorial (mE) air masses are depicted over relevant continents and oceans, illustrating their typical zones of origin and influence.
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Air mass

meteorology
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Air mass, in meteorology, large body of air having nearly uniform conditions of temperature and humidity at any given level of altitude. Such a mass has distinct boundaries and may extend hundreds or thousands of kilometres horizontally and sometimes as high as the top of the troposphere (about 10–18 km [6–11 miles] above the Earth’s surface). An air mass forms whenever the atmosphere remains in contact with a large, relatively uniform land or sea surface...

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