An arctic air mass sprawling across the eastern, central and parts of the western U.S. on Monday will channel temperatures 20-30 degrees below already historically cold January averages and was poised to slam parts of the South with a disruptive winter storm.

Most of the United States is being assailed with extreme winter weather this week as Arctic air blasts south from Canada, snow tracks up the Northeast coast and a potentially crippling winter storm takes aim at the South.

HEB is adjusting its store hours ahead of the winter storm that will start Monday night and leave Houston covered in snow Tuesday, the grocery chain announced.

H-E-B is adjusting store hours across parts of Texas as winter weather moves through much of the state, including the Houston area. Winter Storm Enzo is expected to arrive in southeast Houston sometime Monday evening,

Most H-E-B Pharmacy locations will follow the same adjusted hours as the store. Customers are asked to check their app for updates on curbside and home delivery availability. We h