A severe thunderstorm with tornado potential is moving through Pearl River County, Mississippi. This live blog is now closed.

Flight cancellations and delays are expected across the U.S. due to severe weather moving over the South, and it's possible for tornadoes to form near the Gulf Coast. NBC’s Adrienne Broaddus reports and Angie Lassman tracks the forecast.

Severe storms are causing flight delays across the U.S. as holiday travelers face tornadoes, damaging winds, and heavy snow.