A low pressure system and associated cold front will slowly move into western Wyoming today.  Expect cloudy to mostly cloudy skies with scattered rain and snow showers.  Light snow will be likely over the mountains and mountain passes, while a rain/snow mix is expected for elevations above 6,000 feet.  Elsewhere, we will see thickening clouds and mainly dry conditions during the day.  Temperatures will be cold and slightly below normal in western Wyoming, with highs in the 30's and 40's.  For the rest of Wyoming, temperatures will be cool, but close to the average for this time of year.  High temperatures will be in the 40's and 50's.  This weather system will move in a west-to-east direction across the rest of the state later this evening and overnight.  Light snow or mixed showers will be possible overnight across western Wyoming.  Meanwhile, rain will develop in central and southeastern Wyoming and will then mix with and possibly turn to light snow.  Roads will stay mainly wet across lower elevations into the late evening hours and could then become slick and icy into early Friday morning as temperatures drop.  There will be only a small chance for rain and snow throughout northeastern Wyoming.  This weather system will then push out of the region on Friday.  Clouds will linger across the entire state during the morning hours.  Light snow or mixed showers will also be possible early across south-central and southeastern Wyoming.  Slick and icy roads are possible during the morning hours, especially over mountain passes and southern portions of the state.  We will then see gradually clearing skies and improving road conditions for the rest of the day.  Temperatures will also become colder and near or slightly below normal.  By late Friday night, winds will increase and become strong statewide, with gusts as high as 50 mph.