The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges south into the U.S., Europe ...
A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by ...
The plunging polar vortex brought subfreezing temperatures ... for the Gulf Coast and pushed the low temperature in El Paso, along Texas' border with Mexico, to 31 degrees (minus 0.5 Celsius ...