During the middle of January, a brief shift of the polar vortex will direct waves of cold air southward and could raise the chance of snow in the central and eastern United States that have experienced little cold or snow thus far this season.
The pattern of cold air coming and going will continue be a theme for January.
Following the arctic blast around the Great Lakes and Northeast states from Sunday to Tuesday, temperatures will trend to above-average levels over much of the Central and Eastern states for a several-day stint.
The mild air will reach a peak over the northern Plains on Friday, the Midwest on Saturday and the East on Sunday.
Temperatures will peak in the middle 30s F in Minneapolis, the lower 40s in Chicago, the upper 50s in Washington, D.C., and near 60 in Atlanta. However, the warmup will be of short duration.