Fog, with visibility below a quarter of a mile at times, will require lower speeds, and greater distances between vehicles. Motorists should use caution if out driving and be prepared for sudden changes in visibilities. Do not assume the road ahead is unobstructed. Use low beam headlights, and allow more time to reach your destination safely.

Fog, with visibility below a quarter of a mile at times, will require lower speeds, and greater distances between vehicles. Motorists should use caution if out driving and be prepared for sudden changes in visibilities. Do not assume the road ahead is unobstructed. Use low beam headlights, and allow more time to reach your destination safely.

Patchy dense fog has developed this morning across the area reducing visibility to less than one-quarter mile especially near area waterways. When traveling this morning be prepared for sudden drop in visibility due to the fog. Slow down and drive with caution. Keep your distance from other vehicles and turn on your low-beam headlights when driving in fog. The fog will dissipate by mid to late morning giving way to mostly sunny sky and warm temperatures.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of east Tennessee and southwest Virginia. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous. Drive slowly and keep your distance from other vehicles. Turn on your low-beam headlights when driving in fog.