From the evening of January 5th through the morning of January 6th, wind chills across the area dipped into the -20s and -30s. Two peaks in the wind chills were noted in most locations. The first peak occurred in the evening hours on January 5th as a surge of wind accompanied the arrival of Arctic air. The second peak occurred in the early morning hours on January 6th as temperatures fell to their lows, with winds still a breezy 15 to 20 mph in most locations. These readings are from automated sensors across the area.
A strong low pressure system moved off the polar region and into the central United States on January 5th, bringing much colder air into the central US. Gusty winds accompanied the low pressure system, creating bitterly cold wind chills across the region.