The system that is going to bring the big change over the next 3 days can be seen in the satellite photo along the Pacific Northwest coast this morning.
|Infrared satellite and 50 0mb analysis Tuesday morning 09/24/13|
|Tue am 9/24/13|
|Wed am 9/25/13|
|Thu am 9/26/13|
|Fri am 9/27/13|
|Sat am 9/28/13|
The first is a model probability forecast of both rain and snow.which indicates that precipitation will begin in the form of rain during the day on Wednesday and turn to all snow by Wednesday night.
|Green is liquid and blue is frozen probabilities with the time in GMT.|
|The black line is the mean of many model forecasts for the same time in hundredths of an inch.|
The next forecast is for the total amount of snow in the valley floor.
|The black line is the mean of many model solutions for total snow fall Star Valley in inches|
The forecasters at the Weather Prediction Center of the NWS make forecasts based on these models for the next 3 days. The first image is the expected 3 day total of precipitation, indicating a major event for much of northern and western Wyoming.
|Total precipitation Tuesday through Thursday Sept 24-27 2013|
From these forecast graphics, Star Valley floor has about an even chance of 2 inches over the next 3 days with a near certainty in the mountains of much of western Wyoming. Of more importance to hunters and those in the mountains of northwest Wyoming is a good chance of 8 inches and even 30 percent probability of a foot or more around YellowStone NP.