HIDE Special Weather Statement issued March 25 at 11:33PM EDT by NWS Greenville-Spartanburg
...AREAS OF DENSE FOG EXPECTED OVERNIGHT...
Low-level moisture from rain Monday afternoon and evening has
allowed patches of dense fog to form across the Piedmont and many
of the mountain valleys. Drier air moving in from the northwest
will overspread the area through the early morning hours, but
until it does, the fog will likely expand in areal coverage over
the next few hours.
If you plan to travel overnight, be prepared for sudden changes in
visibility. Slow down, use low beam headlights, and leave extra
space between you and the vehicle in front of you.