Texas, polar vortex

The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges south into the U.S., Europe ...
Most of the holidays may be over, but winter is sticking around — and it's bringing freezing weather to Texas next week. A polar vortex, a weather pattern similar to the historic winter storm ...
A polar vortex has triggered freeze warnings across Texas, leading to dangerous conditions for people and infrastructure.