Fog will develop overnight across much of Southwest and Southside Virginia, extending southward into Northwest North Carolina. The fog should be the most dense along the higher elevations of the Blue Ridge, from Floyd, Virginia, into Northwest North Carolina. Visibilities under a quarter mile may occasionally be seen along parts of I-77 between Hillsville and the North Carolina border, and along the Blue Ridge Parkway from the Meadows of Dan to Blowing rock. If out traveling overnight, be prepared for sudden changes in visibility. Slow down and use the low beam setting of your headlights in foggy areas. Be sure to allow extra time to reach your destination. Additional statements will be issued as conditions warrant.