The Great Smoky Mountains website is reporting that the Clingmans Dome Road is closed due to ice and snow.
They also give this weather warning:
A winter storm is forecast for the mountains (above 3,000 feet elevation) Thursday through Friday night. If you are planning to travel on US-441 through the park this weekend, please call (865) 436-1200 for road and weather updates. You can also call 511 in either North Carolina or Tennessee to access the Department of Transportation Information Line for updates on US-441.
The National Weather Service has posted this forecast:
RAIN SHOWERS WILL CHANGE TO SNOW SHOWERS THIS EVENING ACROSS THE HIGHER ELEVATIONS OF THE SMOKIES AND SURROUNDING AREAS. COVERAGE OF SNOW SHOWERS WILL INCREASE TOWARD DAYBREAK...AND BY LATE FRIDAY MORNING...SOME HEAVIER BURSTS OF SNOW WILL BE POSSIBLE. SNOW SHOWERS WILL BEGIN TO DECREASE IN COVERAGE FRIDAY EVENING... BEFORE TAPERING OFF TO FLURRIES SATURDAY MORNING. TOTAL SNOWFALL ACCUMULATIONS OF UP TO 7 INCHES WILL BE POSSIBLE...MAINLY IN AREAS ABOVE 3500 FEET.