The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges southward into the U.S., Europe and Asia. Studies show that a fast-warming Arctic is partly to blame ...
North Texas, including Dallas-Fort Worth, is on alert for wind chills ranging from 5 to 10 degrees, which could cause frostbite in minutes. Meteorologist Dylan Federico called the situation "dangerous ...