A dangerous winter storm sweeping across the South is dumping heavy snow across Houston and other major metropolitan areas along the Interstate 10 corridor.

A winter storm sweeping through the U.S. South on Tuesday was dumping snow at levels millions of residents haven't seen before. Moisture from the Gulf of Mexico was combining with a low-pressure system and chilly air to drop significant amounts of snow in some spots.

More than 230 million people across the United States are facing dangerous cold that will also open the door for a potentially historic and crippling winter storm.

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A very rare winter weather event will pass through the Deep South beginning Monday night, and even down along the Gulf Coast on Tuesday. As an arctic front lifts north across the Gulf of Mexico, a low pressure system will intensify and track eastward and dump Gulf moisture into the cold air for the Gulf Coast states.

Most cities in the region don't have snowplows. Louisiana had 400,000 pounds of salt ready to spread over roads and bridges in preparation for the icy conditions.

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Warmer-than-normal temperatures in the Gulf of Mexico did not cause the record-setting snowfall, but the conditions may have been an ingredient to the unusual weather.

Thousands of miles of coastline between Texas and Florida were buffeted by powerful snowstorms over the past few days, with many locations across the Gulf Coast seeing record-breaking snowfall. Some areas in Louisiana and Alabama saw over 11 inches of snow,

Historic winter storm shatters records across the South, leaving millions grappling with extreme cold and unprecedented snowfall into the weekend.