Air Masses Page: 11 of 16
iii, 12 p. : ill., maps ; 27 cm.View a full description of this pamphlet.
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FRAME 3 (continued)
A small letter 'w' indicates that the air is warmer than the ground over which it is flowing,
thus STABLE. A small letter 'k' is used to indicate that the air is colder than the ground over
which it is moving and thus, UNSTABLE. These small letter designations follow the capital letter
temperature designators. For example, cPk indicates cold, dry unstable air.A
WARM SURFACE
"k" = U NSTABLEB
COLD SURFACE
"W"= STABLEThe designation mTw indicates an air mass is
a. warm, dry, and stable.
(P warm, moist, and stable.
c. warm, moist, and unstable.
d. cold, dry, and stable.7
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Snyder, Henry W. Air Masses, pamphlet, February 1971; Texas. (https://texashistory.unt.edu/ark:/67531/metapth46578/m1/11/: accessed May 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Boyce Ditto Public Library.