I know that this info is embedded in this week's Report (8/31/2017), but do note this paragraph in the MW OBS Weather Report!
"If venturing above treeline Thursday or Friday, expect to be met with wintry conditions in the form of high winds and sub freezing temperatures with wind chills plummeting towards the zero degree mark. On top of the cold and windy conditions, snow showers are possible Thursday night into Friday which will combine with significant ice accumulations to create slick surfaces across the higher summits."