Tornado outbreak live updates: 40 tornadoes, 34 dead in cross-country storm system

At least 289,054 utility customers from Michigan to Georgia were without power Sunday morning, according to the website that tracks power outages nationwide.

Most of the power outages -- 235,654 -- were in Southern states, according to poweroutage.us. More than 54,000 power customers in North Carolina and more than 55,500 in Georgia were without electricity, according to the website.

Power outages were also being experienced in Tennessee, where nearly 27,000 customers were without power; Alabama, where more than 27,000 customers were without electricity; and Mississippi, where more than 10,000 customers were impacted.

More than 61,000 utility customers in Missouri and more than 14,000 in Ohio were without power, according to the power outage tracker. And in Michigan, nearly 40,000 customers were without electricity.

ABC News' Juwon Funes

A tornado watch was issued Sunday for southeast Georgia and the Carolinas, according to the National Weather Service Storm Prediction Center in Norman, Oklahoma.

Damaging winds up to 70 mph and a few tornadoes are possible from Sunday morning to early Sunday afternoon from Savannah, Georgia, and into Charleston and Columbia, South Carolina, and Wilmington, North Carolina, according to the NWS.

"A broken band of thunderstorms will continue east into the Watch area this morning within a weakly unstable airmass with very
strong flow aloft," the NWS said. "A greater risk for wind damage along with a threat for a couple of tornadoes."

ABC News' Max Golembo

More than 250,000 customers were without power across six states early Sunday, according to Poweroutage.us, a site that tracks energy providers.

About 70,000 customers were without power in Georgia, followed by about 63,000 in Missouri. Another 42,000 were without power in Tennessee, followed by about 37,000 in North Carolina, about 36,000 in Alabama and about 10,000 in Mississippi.

Farther north, about 40,000 in Michigan and about 15,000 in Ohio were without power.

-ABC News’ Charlotte Slovin

At least six people have died in Mississippi in the outbreak of tornadoes Saturday, the governor said.

Another three people are missing and 29 people are injured, Gov. Tate Reeves said in a social media post Saturday night.

"Please pray for those who lost their life, those who are missing and those leading the search efforts, those who are healing, and their families," Reeves said in the post.

Three of the deaths -- including of a juvenile -- were in Tylertown, not far from the Louisiana state line, according to Tylertown Police Chief Jordan Hill.

The governor signed a state of emergency declaration that he said will allow the state to further mobilize state resources. Overall, 21 counties sustained storm damage and about 16,000 are without power, the governor said.

The deaths in Mississippi brings the total death toll from an outbreak of severe storms over the past day to 34 people as of Saturday evening.