Air Masses Page: 10 of 16
iii, 12 p. : ill., maps ; 27 cm.View a full description of this pamphlet.
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ANSWEtR: b. Turbulent air, cumulus clouds, and cold dry air.
FRAME 6
Since the general motion of the atmosphere in the United States is toward the east, the polar
and arctic air masses generally move toward the southeast and the tropical and equatorial air
masses move toward the northeast. The speed varies according to the season and the type of air
mass, but it generally averages 500 to 700 miles a day. Cold air masses tend to move more rapidly
than warm air masses.Sources and Direction of Movement of Air Masses Influencing North American Weather
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Snyder, Henry W. Air Masses, pamphlet, February 1971; Texas. (https://texashistory.unt.edu/ark:/67531/metapth46578/m1/10/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Boyce Ditto Public Library.