A large trough of low pressure will become settled over the state of Wyoming today through Saturday.  This will allow very cold, Arctic air to be transported into the region during this time.  Faster-moving weather disturbances will also pass through the area.  For today, expect cloudy to mostly cloudy skies with noticeably colder and closer to average temperatures.  Highs will be in the 20's and 30's.  The best chance for snow today will be in western and south-central Wyoming.  Slick and icy roads are expected on the mountains and mountain passes as well as parts of I-80 (Utah state line to Arlington).  Elsewhere, expect a smaller chance for snow and only isolated slick spots.  By later this evening and tonight, light to scattered snow showers will be likely statewide.  Watch out for periods of reduced visibility.  While generally small accumulations are expected, roads will likely become slick and icy.  We will continue to see cloudy, overcast skies with light to scattered snow showers on Friday and Saturday.  Once again, roads will likely be slick and icy.  Temperatures will also become bitterly cold during this time, with highs only in the teens to lower 20's.  Winds will not be a problem into the start of the weekend, but wind chill values will be even colder and well below zero for most locations.