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

Our chilly weather could bring freezing rain and snow to parts of the Hill Country and I-35 corridor, local forecasters say. Why it matters: A polar vortex hauling arctic air from Canada down across the U.

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.