This coming week will see a changing weather pattern as the storm track shifts southward over the Western U.S. The first storm will be be sending a cold front across Star Valley today accompanied by some precipitation…particularly along and over the mountains. Precipitation should initially be in the form of rain in the valley, but the snow level should drop to the valley floor by this evening. Once the cold front moves onto the east, the accompanying upper trough of low pressure will be intensifying as it moves across western Wyoming overnight. This will continue at least some light snow over the valley through the night with several inches likely falling in the higher elevations of the Salt and Wyoming Ranges.
Even though it will be intensifying, the upper trough should move east of the valley, by mid day Tuesday with a diminishing snow threat and some clearing by afternoon. The colder air will keep temperatures in the valley in the 30s all day. Tuesday night high pressure and clearing skies will allow temperatures to drop into the teens.
After a cool but generally fair Wednesday and much of Thursday, a much stronger storm will be developing into the western states by later Thursday. This storm will spread a much larger area of precipitation in the form of snow across much of the northern Intermountain region including Star Valley. Heavy snow is likely with this system but at this time the primary threat area is still uncertain. It is possible it will move far enough to the south to place the area of heavy snow across northern Utah or even further south. However it is quite likely that at least a few inches could occur in Star Valley beginning late Thursday into Friday. This storm will be followed by even colder air that the one now approaching and Saturday morning could see single digits in the coldest valley locations if skies clear sufficiently.