The children, ages 3 and 8, were killed when a tree fell on a auto Saturday.
The tree "flattened the auto like a pancake", said Capt. Alton Lenderman of the Angelina County Sheriff's Office. The children, ages 8 and 3, were dead at the scene, while both parents, who were in the front seat, escaped injury, he said.
In neighboring Houston County, the sheriff's office said one person was killed in Weches, 6 miles southwest of Caddo Mound.
Damage to the town's schools has prompted the Alto Independent School District has canceled all classes until its buildings have been found to be safe.
The agency says a survey team found evidence of an EF-3 twister with winds of at least 136 miles per hour near Weches, Texas, and two other smaller tornadoes touched down in the same region Saturday. Mobile homes will be damaged or destroyed. Some people had to be extricated from damaged dwellings.
Heavy rains and storms raked MS into the night Saturday as the storms moved east.
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"It looks like a storm came up through Louisiana and into MS and exploded in Monroe County", Monroe County Sheriff Cecil Cantrell said. At least 19 others were injured and taken to hospitals for treatment, the AP reports.
A MS man, identified as 95-year-old Roy Ratliff died on Saturday when a tornado caused a tree to fall onto his home, Monroe County Coroner Alan Gurley said. A mobile home community was damaged, but no injuries were reported.
The Times Gazette reported several homes and businesses were damaged after an apparent tornado struck Shelby, Ohio, Sunday about 4 p.m.
More than 79,000 homes and businesses were without power in Virginia, according to the tracking site PowerOutage.US, with 89,000 more outages reported across Pennsylvania, North Carolina, Michigan, Maryland and NY. Homes were damaged about 250 miles (402 kilometers) to the north in Glencoe, and there's scattered damage south of Birmingham.
Multiple crashes, downed trees and flooded roads were reported on 511.nj.org, the state's traffic website.
The weather says the numbers could go up because teams are still assessing damage. Meteorologists will study damage to trees and structures, and trace the track of the debris. The 13-year-old boy drowned in a drainage area in West Monroe late Saturday afternoon, the Ouachita Parish Sheriff's Office said.
A wave of strong storms and possible tornadoes swept through Alabama overnight Saturday into Sunday, leaving destruction in several places.