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Equatorward Motion of
Cold Airmasses
qTwo factors contribute
to the equatorward motion: (1)
cold dense air moves toward
warm light air and (2)
upper-level steering
winds.
qTo the east of the
upper-level ridge, the
upper-level flow has an
equatorward component that steers
cold air masses equatorward.
qPacific cyclone and
cyclone east of the
Rockies or along the East Coast
can intensify the upper-level
ridge.