What severe weather conditions are currently affecting the southern United States?

The southern United States is currently experiencing extreme cold warnings and watches issued by the National Weather Service, particularly affecting the Texas-Mexico border region. This polar air mass has created hazardous conditions throughout the area. Simultaneously, severe weather is sweeping across the southern states with significant moisture moving toward the Carolinas. This dual threat of extreme cold and moisture-laden storm systems is creating challenging conditions, potentially leading to hazardous travel and localized flooding in affected communities.