NORFOLK, Va. (AP) — A developing winter storm threatens to drop snow, sleet and freezing rain on parts of Texas, Oklahoma and Arkansas as frigid air that escaped the Arctic plunges temperatures to subfreezing levels in some of the southernmost points of the U.S.

Storm Blair has hit most of the U.S., bringing freezing temperatures to Texas. Precipitation later this week could mean snow for some areas.

A polar vortex is bringing freezing temperatures to Texas this week, with a couple of rounds of precipitation that could cause issues on untreated roads.