Models Really Insisting on Significant Snow event for Rockies and Northern Plains

This mornings GFS run for accumulated snowfall...

Here is the storm near its peak on Saturday..

As it deepens it pulls in enough cold air for snow in South Dakota. Pretty impressive for this time of year. As a side note this storm will produce  tornadoes in Iowa and dangerous thunderstorms downstream as it progresses its cold front into the Mississippi valley. 

More tonight.