![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/qpf_acc.us_nw-1038x576.png)
First Week of Spring/Last week of Winter?
Spring officially begins Tuesday March 20, however in Star Valley the coming week well feel like more of a return to late winter by the end of the week. While a high pressure ridge moves across Wyoming by mid week, a large low pressure trough again dominates the the western states by the first weekend of Spring bringing snow back into the area, particularly the mountains. Following is a series of 500 mb forecast chart of the changes in the flow pattern for this coming week.
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/500wh.conus_-300x232.png)
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/500wh.conus-1-300x232.png)
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/500wh.conus-2-300x232.png)
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/500wh.conus-3-300x232.png)
The week will be particularly wet in parts of California where it is needed. In the mountains of Western Wyoming substantial precipitation is also possible noted in the following graphic.
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/qpf_acc.us_nw-300x232.png)
Snowfall will be heaviest in the higher mountains with both rain and snow in the valley, including Star Valley by the end of the week.
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/snku_acc.us_nw-300x232.png)
The following table details the forecast expected for Afton Wyoming through next Sunday March 25 2018
![](https://blog.starvalleyweather.com/wp-content/uploads/2018/03/aftom-300x295.jpg)