Some Areas of Dense Valley Fog Early This Morning... Clear skies and light winds have prompted the development of fog in the deeper valleys along the larger creeks, lakes, and rivers this morning. This fog is locally dense in some areas. Visibilities in the thickest fog will be down to one quarter mile or less. Be sure to slow down, allow extra time to reach your destination, and use low-beam headlights while driving through fog. The fog will lift and dissipate by 930 AM EDT.