Winter Storm in Mccormick, South Carolina

A band of heavy snow mixed with sleet moved into the county on the morning of the 10th. A COOP observer estimated around 1.5 inches of snow and sleet accumulated in McCormick. Warm air moved in aloft and by the afternoon, snow and sleet transitioned to freezing rain but no ice accumulation was reported. By late afternoon, temperatures rose above freezing and precipitation transitioned to liquid rain.

A broad mid-level trough pushed across the eastern CONUS throughout January 10th. The associated surface low pressure and warm advection caused a brief band of heavy snow, sleet, and freezing rain to develop in the Central Savannah River Area and southern Midlands. As temperatures warmed aloft and cold air damming conditions strengthened at the surface, the freezing rain shifted northwards with portions of the central and northern Midlands receiving up to 0.25 ice overnight into January 11th.