High pressure building into Wyoming from the west will lead to improving weather for Jackson Hole on Tuesday with partly cloudy skies early giving way to mostly sunny skies for the remainder of the day. Highs will reach the upper 50s to low 60s in the valley with dry conditions expected, although winds will remain brisk at times from the west/southwest in the valley and west/northwest in the mountains.
On Wednesday, we’ll see a more significant warm-up with mostly sunny skies and highs approaching 70 degrees in the valley along with lighter winds. Wet weather will then return on Thursday as a system arrives from the west, bringing widespread rain showers to the area from Thursday morning through Thursday evening. A few heavier showers will be possible along with the chance for an afternoon thunderstorm.
Temperatures will remain very mild on Thursday, and as a result, rain will fall even across the higher elevations. Warm temperatures and a lack of overnight freezes in the mountains will likely lead to a spike in snowmelt, runoff and wet avalanche activity later this week. On Friday and Saturday, we’ll dry out somewhat but enough lingering moisture in the atmosphere could result in some isolated shower and thunderstorm activity either day.
Alan Smith, Meteorologist