Polar vortex brings extreme cold to the U.S. with dangerous wind chills

A polar vortex is bringing extreme cold to the U.S., affecting the Rockies and northern Plains. This follows winter storms that caused flooding in Kentucky, resulting in at least 10 deaths. Temperatures in northeastern Montana could drop to 45 degrees below zero. This is the 10th polar vortex event this season, with wind chills expected to reach minus 60 degrees Fahrenheit in parts of North Dakota. The National Weather Service warns of frostbite and hypothermia risks due to the severe cold. While the U.S. faces harsh winter conditions, global temperatures continue to rise. January set a new heat record, marking the 18th of the last 19 months above the 1.5 C warming limit.