A winter storm could affect the southern Appalachians starting tonight and continuing through Friday night, and significant icing is possible across much of the East Tennessee Valley, forecasters said.
The National Weather Service in Morristown said subfreezing surface temperatures and moisture from the Gulf of Mexico will result in a wintry mix of precipitation across the area.
A winter storm watch is in effect for counties in the region including Anderson, Campbell, Knox, Loudon, Morgan, Roane, and Scott.
The precipitation will start moving into the area late Thursday night and could spread over the region after sunrise, the Weather Service said.
Freezing rain and sleet can be expected across southeast Tennessee, extreme southwest North Carolina, and central East Tennessee, including the northern Cumberland Plateau.
The precipitation will likely change to all rain before ending and could taper off by late Friday afternoon or early evening.
“Widespread ice accumulations of a tenth to a quarter of an inch will be possible across much of the area,” the National Weather Service said.
A few inches of snow are possible across far northern areas, forecasters said.