In East Texas, the Angelina County Sheriff's Office said an 8-year-old and a 3-year-old died when strong winds toppled a tree onto the back of their family's auto in Lufkin while it was in motion.
Texas experienced the beginning of the risky and severe storms Saturday.
Two children in East Texas were reportedly killed during a storm Saturday afternoon when a pine tree fell on a moving vehicle where they were seated in the back seat. The parents were in the fronts seats and were not injured. Additional information was not immediately available.
A roof is torn off a home following a suspected tornado, Saturday, April 13, 2019 in Franklin, Texas.
Almost a dozen people in Franklin, Texas, were injured after a powerful storm hit the community Saturday, damaging homes and other property, authorities said.
The storms are part of a large system moving through the southern United States, knocking out power to thousands and causing some flash flooding.
CNN meteorologist Chad Myers said the warm air present during Saturday afternoon enhanced the atmosphere's instability, creating more energy for storms to tap into and aiding in their development.
A curfew was in effect from 8 p.m.to 7 a.m. Sunday in Franklin, Texas, about 125 miles south of Dallas, following a direct hit from a tornado that overturned mobile homes and damaged other residences. Franklin is located about 200 kilometres south of Dallas.
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The National Weather Service said preliminary information showed an EF-3 tornado touched down with winds of 140 miles per hour (225.3 kph).
Two people were taken to a hospital with injuries that aren't thought to be life-threatening, Yezak said.
Meteorologist Monique Sellers said they've received reports of downed trees, as well as damage to buildings and a transmission tower.
Parts of the state were placed under a tornado watch until 5 a.m. Sunday, the station reported.
As a strong upper level and surface low pressure system continues to rotate eastward through Texas on Saturday, clusters of thunderstorms developed Saturday morning across much of the state. Alto is about 140 miles (225 kilometers) north of Houston.
The National Weather Service says thunderstorms are expected Saturday from Texas to Alabama.
The National Weather Service Storm Prediction Center is cautioning that, "Strong tornadoes are possible today into tonight from east Texas into MS, with the greatest threat expected between 2PM-8PM CDT".