About 11 million Americans in that region are at a higher risk for long-track tornadoes Wednesday, CNN meteorologist Michael Guy said.
Long-track tornadoes are the ones that consistently remain on the ground for an extended period of time, unlike a typical one that could be on the ground for just minutes.
“Projections are showing that this will likely be a widespread event, with some of the most severe weather anticipated late Wednesday night into early Thursday morning,” Ivey said in a statement.
“Please make preparations now in the event your area is impacted in some way. I will continue keeping a close eye on the system and encourage every Alabamian to do the same,” the governor added.
Other officials also urged residents of the state to prepare Tuesday.
CNN’s Dave Alsup, Jackson Dill and Jennifer Gray contributed to this report.