From the National Weather Service
A wave of low pressure developed and moved northward along an arctic cold front stalled off the Carolina coast on Friday January 21st, spreading a wintry mix of precipitation across the Carolinas. As temperatures fell below freezing on Friday and rain spread northward. it transitioned to freezing rain then sleet and snow in places into Friday night as the air mass continued to cool.
Areas near the coast reported mainly ice accumulation from freezing rain, while farther inland closer to I-95, snow mostly fell with almost half a foot in a few spots. Other areas reported both ice and snow, while some locations observed bursts of sleet at times. The maps show accumulations of snow versus ice and in some cases the overlap of both. This was followed by the coldest air in several years across the region.
The January 21-22 winter storm yielded a trace amount of freezing rain accumulations across Dillon County, while snowfall averaged 3 inches.