How severe is the cold weather in Dallas due to the polar vortex?

Dallas is experiencing extreme cold with temperatures at roughly 19 degrees but feeling like 2 degrees due to wind chill. The reporter notes it's colder in Dallas than in Reykjavik, Iceland and Anchorage, Alaska. This cold snap has moved down from the north, affecting a large region from Wyoming to Oklahoma with heavy snowfall. The frigid conditions are impacting roads and travel, with high winds creating particular challenges for high-profile vehicles like 18-wheelers, though Texas highways are currently moving without major accidents.