Tornado watches are already in place across parts of the region and the potent storm system has already been producing strong tornadoes in eastern Texas. Some storms will be strong/severe. However, a few storms may reach severe limits in South Mississippi and may be capable of isolated damaging wind gusts and tornadoes.
The main line of storms will begin to push into this area late Sunday morning and trek to the east in the afternoon. The Angelina County Sheriff's Office says an 8-year-old and 3-year-old died after the tree hit the back of the vehicle in Lufkin, about 115 miles (185 kilometers) northeast of Houston.
The large storm system also knocked out power to thousands and caused flash floods.
The weather service said preliminary information showed an EF-3 tornado touched down with winds of 140 miles per hour (225.3 kph). At least one mobile home was destroyed, throwing a man from the mobile home.
Authorities say a possible tornado has touched down in western MS, causing damage to several businesses and vehicles.
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Public Information Officer Glenn Springfield also confirmed to PEOPLE that over the weekend, a 13-year-old boy died in West Monroe, Louisiana, after drowning in a drainage area. The death is believed to be storm related, the sheriff's office said. Starting out with hit and miss storms this morning, storms should remain below severe limits early but that all changes later today.
Population centers in the zone of greatest risk, 4 out of a possible 5 on the Storm Prediction Center's scale, include Monroe and Alexandria, Louisiana.
More than 100 million people from the middle of the United States to the East Coast were at risk of extreme weather, facing warnings of heavy thunderstorms and another round of tornadoes, said NWS meteorologist Bob Oravec. Violent weather is unlikely to be as widespread as Saturday, but some of Sunday's storms may be intense. Trees were down throughout the hilly city on a bluff overlooking the Mississippi.
Both Franklin and a neighboring town lost electricity as a result of the storm, leaving 3,088 customers without power on Sunday, reported CNN.
The storms are expected to move through the Augusta area during the afternoon and evening.