A frigid blast of winter weather across the U.S. plunged Texas into an unusually icy emergency Monday that knocked out power to almost 4 million people and shut down airports and roads.

A truck drives past a highway sign Monday, Feb. 15, 2021, in Houston. A frigid blast of winter weather across the U.S. plunged Texas into an unusually icy emergency Monday that knocked out power to more than 2 million people and shut down grocery stores and dangerously snowy roads. (AP Photo/David J. Phillip)