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Utah will have it's own cool change this weekend as the hot, southerly to southwesterly from the American southwest are replaced by westerly to northwesterly flow originating over the Pacific Ocean. I am counting the minutes!
The NWS forecast calls for above average temperatures to predominate through Saturday, with high temperatures for today, Friday, and Saturday, of 93˚F, 91˚F, and 97˚F, respectively. The GFS forecast for 6 PM MDT Saturday (0000 UTC 10 June) shows hot, continental, southwesterly flow across Utah. However, it also shows an approaching cold front over central and eastern Nevada, with a 22˚C 700-mb temperature contrast from central Utah to northern California.
By midnight MDT (0600 MDT 10 June), the cold front and the start of the cool change is forecast to be moving across northern Utah.
And, but noon MDT sunday (1800 UTC 10 June), we are solidly in the post-frontal airmass and 700-mb temperatures have dropped to just below 0˚C. Splendid!
The GFS time height section shows the situation, with a very well defined cold front moving across the Salt Lake City International Airport just after 0600 UTC Sunday. The front is predominantly dry and will probably produce no precipitation, but it could produce a few low clouds over the mountains.