Wind chills are well below zero in some areas as bitter cold begins to grip U.S.

Wind chills are well below zero in some areas as bitter cold begins to grip U.S.

Widespread negative temperatures have been observed. This, combined with sustained winds of 20 - 30 mph and higher wind gusts of up to 60 mph, have and will continue to lead to wind chills as low as 40 below across a large swath of the Intermountain West and northern/central Plains, with more localized areas of 50 to 70 below possible through the end of the week.