TEXT: Ice Crystals form on a window Thursday, Jan. 31, 2019, in Pepper Pike, Ohio. The painfully cold weather system holding much of the Midwest in a historic deep freeze sent temperatures plunging to record low temperatures in several cities Thursday, and while a dramatic swing of as much as 80 degrees is expected by early next week, the weather system continued to wreak havoc to air travel and other infrastructure as it marched eastward.