Patchy Dense Fog Across Southern Lake, Orange, and Osceola Counties... At 7 AM, surface observations, satellite imagery and traffic cameras continues to show patchy dense fog occurring across southern Lake, Orange, and Osceola Counties. The fog was reducing visibilities to around a mile or less. The fog is expected to burn off by around 9 AM. Drivers should prepare to encounter rapid visibility reductions early this morning. When driving in fog, slow down, use only your low beam headlights, and leave extra distance between your vehicle and the one in front of you.