Millions of people across the northern Gulf Coast braced Tuesday for a rare winter storm that's expected to scatter heavy snow, sleet and freezing rain around the Deep South as a blast of Arctic air plunges much of the eastern U.

Around 40 million people in the U.S. are under a winter storm warning from an unusual blast of severe winter weather.

For the first time in seven years, the National Weather Service issued a Winter Storm Warning for Florida. Here's what that means for Jacksonville.