Dense Fog in Central Yampa River Basin, Colorado

Localized dense fog developed within the Central Yampa River Basin late in the night on November 22. The KCAG ASOS at the Craig-Moffatt County Airport reported very brief periods of 1/4-mile visibility within the span of an hour just after sunrise due to freezing fog. No reports of injuries, damages, or fatalities were received.

With a low passing to our south, calm winds and clearing skies began to dominate the region. Though the mid-level atmosphere was quickly drying out, low-level moisture persisted in lower valleys across the western slope of the Rockies. Patchy fog was able to develop across portions of northwestern Colorado as a result, and widespread fog developed over portions of southwestern Colorado before quickly burning up after sunrise.