Special Weather Statement issued April 25 at 3:34AM CDT by NWS
Effective: 11:08 a.m. on Tuesday, April 24, 2018
Expires: 7 a.m. on Wednesday, April 25, 2018

...Patchy Dense Fog Early This Morning...
Remnant moisture from recent rain has combined with a clear sky
and light wind to result in the formation of patchy dense fog
in some locations early this morning. The fog will likely persist
through sunrise, then diminish by mid morning.
Motorists should slow down and be prepared for rapid reductions
in visibility. Use low beam headlights and give yourself plenty of
following distance in case of sudden stops.

See more at NOAA