As seen in the 0100 UTC (0700 PM MST) regional radar composite below, precipitating convection was confined primarily to eastern Utah yesterday evening, but should be statewide (but scattered) today.
The net impact of this large-scale pattern is strong confluence between relatively dry air from over the eastern Pacific Ocean and relatively moist air originating over the Gulf of Mexico. This produce a strong gradient in precipitable water over our region, which shifted northward and westward across Utah late yesterday and overnight. This shift partly reflects the amplifying trough on the west coast and apparent retrogression of the large-scale ridge, which could be related to diabatic heating associated with convection over eastern Utah and Colorado yesterday. The easterly wave helps to enhance moisture transport into the four corners area.
Thus, after a nice weekend, we should see scattered showers and thunderstorms this afternoon in northern Utah. One can never complain, however, when it is showery in Salt Lake in July.