Weak high pressure will build over the entire state of Wyoming today.  Expect sunny to mostly sunny skies, breezy winds, and mainly dry weather conditions.  Temperatures will also be warmer and closer to average, with highs in the 60's and 70's.  An upper-level weather system and cool front will then move across northeastern portions of the state on Friday, while higher pressure continues to build elsewhere.  For northeastern Wyoming, expect cloudy to mostly cloudy skies, significantly cooler temperatures, and a chance for rain and possibly a few thunderstorms.  For the rest of the state, expect minimal cloudiness, breezy to gusty winds, and seasonably mild temperatures.  There will be only a small chance for showers and thunderstorms, mainly late in the day and overnight.  Another weather system will then push across the entire state this weekend, which will bring cooler temperatures and a better chance for unsettled weather.