Mid-Summer Frost in Star Valley?

Mid-Summer Frost in Star Valley?

The final week of July is climatologically the warmest of the year in Star Valley. However an unseasonably  strong upper trough will bring a taste of fall in Mid-summer to western Wyoming early next week.

500 mb Forecast 6am Tuesday  July 28 2015

Surface Pressure and temperatures 6am Tuesday July 28 2015

Temperatures in the typically colder valley locations could drop to the mid 30’s  by Tuesday morning with areas of frost.   Similar conditions could also reoccur  Wednesday morning prior to much warmer temperatures as high pressure develops over the area.

If these temperatures are reached they would be near record lows for the last week of  July.