A storm system will move through the southern Rockies and into the southern Plains Thursday before heading into the southeastern States this weekend including Middle Tennessee.

Moisture will be drawn north ahead of the low-pressure system as colder air sinks southward.

A mix of snow, sleet and rain is expected Friday night with snow continuing into Saturday night.

At this time, an accumulating snow is expected with up to two inches over most parts of the mid-state and up to three inches along the Cumberland Plateau by late Sunday.

Some uncertainty remains in the eventual track of the storm system and snow amounts.

People planning travel on Christmas eve or Christmas day may want to consider traveling earlier perhaps Thursday or Friday as it appears the wintry weather could begin in Middle Tennessee as early as late Friday afternoon as road conditions will likely deteriorate quickly once the snow begins.

There have been only nine Christmases with measurable amounts of snow since snowfall record keeping began in Nashville back in the winter of 1884 and 1885.

The last time measurable snow fell on Christmas day in Nashville was in 1993 when three-tenths of an inch was measured.

Trace amounts of snow fell on Christmas in 2002. The most snow ever to fall on Christmas in Nashville is 2.7 inches in 1969.

Statistically there is only a 7 percent chance of measurable snow on any given Christmas.