Air Masses PowerPoint

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mT Air Masses• Maritime tropical (mT) air masses affecting North America mostoften originate over the warm waters of the Gulf of Mexico, theCaribbean Sea, or the adjacent western Atlantic Ocean.• As expected, mT air masses are warm to hot and they are humid.• During winter, when cP air dominates the central and easternUnited States, mT air only occasionally enters this part of thecountry.• However, during the summer, mT air masses from the Gulf,Caribbean, and adjacent Atlantic cover a much wider area of thecontinent and are present for a greater period.• The mT air masses from the Gulf-Caribbean-Atlantic sourceregion are also the source of much (if not most) of theprecipitation received in the eastern two-thirds of the UnitedStates.
Air Masses and Rainfall• Isohyets, lines drawn on a map that connect placeshaving equal rainfall, illustrate the greatest rainfall inthe Gulf region and a decrease in precipitation withincreasing distance from the mT source region.• Hot and dry continental tropical (cT) air isproduced only in the summer in northern interiorMexico and adjacent parts of the arid southwesternUnited States.
Page 1 and 2: Air MassesDr. R. B. Schultz
Page 3 and 4: Air Mass Source Regions• Areas in
Page 6 and 7: Air Mass Modifications• Once an a
Page 9 and 10: Lake Effect Snow Belts
Page 11: mP Air Masses• Maritime polar air

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