The GFS has come around to a snowy transition to cold.

The first storm coming out of south is a fast mover and without a high to the north pumping moisture west, the northern shield will be slightly restricted.

It sees a clipper coming south and then east through the Midwest.

This will redevelop and this time with the high to the north, the snow shield to the north looks a little like the storms of 2013.

More snows come with the big arctic front that will follow.

With fresh snow and a northerly drainage, this means sub zero cold.

The total snow from the GFS is impressive.

The 10 day period may rank as one of the coldest in years, coming at the coldest time climatologically.

The last five days of the month on the EC ensembles show the cold plume.

The Canadian and EC have backed off slighly.