HOUSTON (Reuters) -A rare winter storm churned across the U.S. Gulf Coast on Tuesday, breaking snowfall records more than a century old in a southern region where flurries are unusual, as much of the United States remained in a dangerous deep freeze.

A once-in-a-generation snowstorm, tied to the polar vortex event across the Lower 48 states, was 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 winter storm prompted a National Weather Service office in Louisiana to issue a first-ever blizzard warning. The storm is causing dangerous conditions from Texas to North Carolina.

Some areas of New Orleans and Houston got more than four inches of snow Tuesday morning in a historic winter storm hitting the south.

A historic winter storm is expected to bring rare heavy snowfall and ice to states along the Gulf Coast and could impact as many as 55 million people through midweek, according to national forecasts.