Dense Fog in Debeque To Silt Corridor, Colorado

Widespread dense fog developed within valleys along I-70 during the morning of January 4. The KRIL ASOS at the Rifle Garfield County Airport reported 1/4-mile visibility due to dense fog for about a half an hour between 5:30-6:00 AM. After a brief period of improved visibilities, dense fog redeveloped around 7:00 AM. Visibilities reached 1/4 mile or less for about 3.5 hours before dissipating. No reports of injuries, damages, or fatalities were received.

High pressure set up across western Colorado overnight from January 3 to 4, leading to clear skies and light winds. Pools of strong moisture remained within many valleys though from precipitation earlier in January. With this, cooling overnight temperatures led to a saturated near-surface environment and widespread dense fog.