Winter Storm in Karnes, Texas

Snow and freezing rain started falling during the evening on the 20th. The freezing rain caused some patchy ice on FM 627 north of Karnes City that caused only minor impacts. Precipitation turned over to all snow, and the CoCoRaHS observer reported total accumulation of 0.3 in Karnes City.

With cold air in place across South-Central Texas an area of low pressure over the western Gulf moved northward along the coast. This brought warm, moist air to the region. Isentropic lift around the north and west sides of the low was sufficient to generate precipitation. Warmer air riding over the cold boundary layer produced a mix of precipitation types and made travel difficult in the Hill Country, I-35 Corridor, and Coastal Plains.