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Historical Temperature Rankings by State: July 1993
The summer of 1993 was unseasonably cold over much of
the mountain
west with drought conditions throughout the southeast.
These weather conditions were caused by two stationary
pressure systems located over the continental United States
at that time.
About the second week of June, a large "dome" of high pressure
in the upper atmosphere became nearly stationary over the
southeastern United States while at about the same time an
unusally strong low pressure system remained stationary
over the Rockies.
The Midwest was unfortunately located at the boundary
of the two competing weather influences.
The high pressure system brought an abundant supply of
warm and very humid air into the region while the low
pressure center spun off regular disturbances across
the plains which generated widespread thunderstorms.
All of the weather systems were locked into place
to some extent during the summer of 1993 by a
persistent ridge of high pressure located over Alaska.
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