A once-in-a-generation snowstorm, tied to the polar vortex event across the Lower 48 states, is plastering the Gulf Coast with record-setting snow and ice on Tuesday. Why it matters: This region isn't equipped to cope with heavy snow,

A snowstorm warning was in effect for 31 million people - from southern Texas east through Georgia and north to the Carolinas and into Virginia - until Wednesday morning, the National Weather Service said.