High pressure over the Rocky Mountain West will result in a beautiful day on Wednesday with mostly sunny skies and warmer than average temperatures. High temperatures should top out around 70 degrees in the valley with light winds. The last time we hit 70 in the town of Jackson was on September 19 (last fall was unseasonably cold), so enjoy today’s warmth!
The stretch of nice weather will come to an end overnight as a system approaches from the west. Rain showers will arrive on early Thursday morning and will continue off and on throughout the day with a good chance of thunderstorms during the afternoon and evening. Moderate to heavy rain will be possible at times on Thursday, and stronger thunderstorms could produce hail and gusty winds. Temperatures will be cooler by way of cloud cover, but overall this will be a mild system and rain will fall even at the higher elevations.
On Friday and Saturday, we’ll be in between weather systems but the pattern will remain slightly unsettled with enough moisture in the atmosphere to result in scattered clouds at times and a chance of isolated afternoon showers/thunderstorms on both days. On Sunday, a storm system will approach from the west, resulting in a good chance of showers and thunderstorms during the afternoon and evening.
A cold front will arrive sometime on Sunday night, which will lead to cooler temperatures and falling snow levels into Monday with shower activity likely to continue.
Alan Smith, Meteorologist