Reference Winter 2019-20 For Major Players

ALERT For Fog & Freezing Fog With Development Of A Deep Saturated Layer Sunday Night Into Monday Morning

Warm air advection centered around 850 MB will strengthen a low-level inversion which developed Sunday over the Great Valley and allow fog and freezing fog to expand in coverage.

A Recap Of Recent Wintry Events_Lingering Autumn Color

A rather interesting setting will feature lowering cloud bases in SW upslope areas of the High Knob Massif-Landform. As low-level temperatures cool ground fog development will become possible until eventually the two layers may be able to combine in a saturated zone through several thousand vertical feet of the atmosphere.

Freezing fog, with riming, is ongoing at upper elevations in the High Knob Massif and Black Mountain on SW flow. The evening-overnight potential will feature lowering of this over time in locations where SW flow rises.

Locations under a persistent cloud cover not subject to rising SW flow may be more protected from widespread fog formation, unless the cloud layer breaks to allow radiational cooling. A complicated setting that will require NOWcasting by forecasters as it evolves.

The 8:00 PM air temperature in Clintwood is 31 degrees but skies are clear. The potential for freezing fog exists but is less than in locations where SW air flow will be rising along the High Knob Landform and Massif (Clinch-Powell basins).