Special Weather Statement issued December 19 at 9:50PM EST by NWS Melbourne FL

Satellite and surface observations are already indicating fog and
visibility reductions, especially along the immediate coast.
Additional fog development is forecast through early Friday
morning across much of east central Florida. Visibility may drop
below one-half mile at times in locally dense fog. If encountering
fog while driving, slow down, use low beam headlights, and leave
plenty of following distance ahead of you.