Patchy Dense Fog Across Portions of Osceola, southern Orange, and northern Brevard counties Early This Morning... At 720 AM, traffic cameras and satellite imagery showed locally dense fog had formed across portions of Osceola, southern Orange, and northern Brevard counties. Visibilities across this area may be reduced to around a quarter of a mile or less. Motorist on area roadways this morning should prepare to encounter rapid changes in visibility from locally dense fog. When driving in fog, reduce your speed, use only your low beam headlights, and leave extra distance between your vehicle and the one in front of you. The fog is expected to lift and diminish by 9 AM.