Swathes of Texas are forecast to be hit with freezing temperatures as a polar vortex is forecast to push frigid winds across the country. With Texas being one of the most populous U.S. states, the prospect of colder-than-usual temperatures would be unwelcome news for many.

A low-pressure system hovering over the U.S. will summon Arctic air into lower latitudes. The extent of the cold snap’s effect on Texas will become clear later this week.