q Air masses have fairly uniform temperature
and moisture content
in horizontal direction (but not uniform in vertical).
q Air masses are characterized by their
temperature and humidity
properties.
q The properties of air masses are determined
by the underlying surface
properties where they originate.
qOnce formed,
air masses migrate within the general circulation.
qUpon
movement, air masses displace residual air over locations thus changing temperature and humidity
characteristics.
qFurther, the
air masses themselves moderate from surface influences.