The Angelina County Sheriff's Office says an 8-year-old and a 3-year-old died Saturday when the tree toppled onto the back of their family's auto in Lufkin while it was in motion.
The Storm Prediction Center has issued a moderate risk (level 4 out of 5) for severe weather Saturday across parts of the Lower Mississippi Valley.
The parents, who were in the front seats, were not injured.
Additional details were not immediately available.More news: Priyanka Chopra opens up on sexual harassment
On Saturday night, the National Weather Service said the Franklin tornado, which tore up more than half the southern part of the city, was an EF-3 tornado with winds of 140 miles per hour.
About a dozen people have been injured in Texas after powerful storms spawned at least one suspected tornado and damaged several homes, authorities said Saturday.
On Saturday morning, the storm system dropped large hail ranging from the size of golf balls to baseballs on a broad swath of Texas from San Antonio to Dallas.
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. Franklin is located about 200 kilometres south of Dallas.
Winds of up to 60 miles per hour (96.56 kph) were reported in Cherokee County, Texas, damaging two homes in Alto but not injuring anyone.More news: You Don’t Need iTunes To Listen To Apple Podcasts Anymore
The severe weather threat Sunday places almost 100 Million Americans at risk of unsafe storms, tornadoes, hail and severe wind gusts, CNN Meteorologist Derek Van Dam said. Two people suffered non-life threatening injuries and others were treated for minor injuries, Robertson County Sheriff Gerald Yezak said.
National Weather Service meteorologist Monique Sellers said they've received reports of downed trees, as well as damage to buildings and a transmission tower.
Heavy rains and storms continued to rake the Magnolia State into the night, with Mississippi State University's 21,000 students huddling in basements and hallways as a tornado came near the school's campus in Starkville.
- A Tornado Watch has been announced for north Georgia until 2 p.m. Sunday.
The most significant risk of severe weather is expected Saturday, but there's still considerable potential Sunday.More news: Why Tiger Woods Is Wearing A Mock Turtleneck At The Masters
Forecasters in central Texas reported a possible twister Saturday in Robertson County, near Hearne and Franklin.
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