Mardi Gras celebrations in New Orleans could be canceled as severe storms rumble through the South, bringing strong winds and the threat of tornadoes Tuesday.

Thousands of revelers in outlandish costumes are filling the streets of New Orleans as the city celebrates Mardi Gras Day despite the threat of storms.

Severe weather alerts caused Mardi Gras parades in New Orleans and other cities throughout the U.S. to be moved up or canceled.