HIDE Special Weather Statement issued October 01 at 4:49AM EDT by NWS Blacksburg
...Areas of fog this morning...
Dense fog is possible in the mountain valleys this morning.
Visibility could be reduced to a half mile or less at times,
especially near the rivers. The fog is expected to linger through
900 AM before dissipating. For your safety, when driving, please
slow down, use low beam headlights, and leave plenty of space
between you and the vehicle in front of you. It is also difficult
to see animals crossing the highway in foggy conditions, so
please reduce your speed.