From private meteorologist Larry Cosgrove -

High Humidity Keeps Temperatures Down In The Desert Southwest

Whereas there is no real relief from the heat in the forecast for the
Great Plains and much of the Old South, the usually seared Desert
Southwest is seeing readings actually come in below season normals,
thanks to the vaunted "summer monsoon". The unwanted side effect of
this cooling, however, is the presence of higher dewpoints and thus
relative humidity, which acts to keep nocturnal temperatures high in
areas not receiving convective rainfall. The monsoon will begin to
erode in the medium range, and soon most of the Intermountain Region
will be one vast atmospheric oven.

The gradual cessation of the western U.S. monsoon will get underway
next week, and the heat ridge which builds over the Intermountain
Region will often extend into the Great Plains and much of the Old
South. Before a weakness takes shape to the right of the Mississippi
Valley (likely around July 28), routinely oppressive heat will be in
store from the Continental Divide into Dixie and parts of the Midwest.

Prepared by Meteorologist LARRY COSGROVE on
Saturday, July 19, 2008 at 6:35 P.M. CT

Disclaimer:

The previous statements are my opinions only, and should not be
construed as definitive fact. Links provided on this newsletter are
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This is "one man's opinion".......

Stan
Oro Valley