The system that will be providing this abrupt change can be seen on this mornings water vapor image approaching the Aleutian Islands
|9am Wednesday July 6 2016|
|500 mb 6am July 6 2016|
|500 mb 6am Saturday July 9 2016|
|500 mb 6pm Sunday July 10 2016|
|Surface 6 PM Sunday July 10 2016|
While confidence is now good that unseasonably cool air will affect Star Valley and western Wyoming the amount of actual precipitation is still uncertain. The models indicate that the heaviest will be in Montana, but at least some is possible across Star Valley.
|24 hour forecast precipitation ending 6 pm Monday July 11 2016|
Of particular interest is the real possibility of a mid July snow event in the higher elevations. The air mass will be cold enough for snow flakes as low as 7000 ft MSL Sunday night, several inches could occur in the higher elevations of the Tetons and YNP.
|6am Temperatures Tue July 12 2016|