Rolling power outages followed the storms, and 170,000 homes and businesses were without power Monday from North Carolina to Pennsylvania.
Two children, ages 3 and 8, were killed when a tree fell on their vehicle as storms hammered east Texas.
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 vehicle in Lufkin while it was in motion.
An EF-1 tornado was confirmed near Buffalo Valley in East Buffalo Township.
Cherokee County Sheriff James Campbell says at least eight of those were injured critically.
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Winds reached 60 miles per hour in Binghamton, the weather service said, as lines of severe thunderstorms rolled into the Northeast Sunday night.
The Storm Prediction Center says trees and power lines are down in Brewton near the Florida line, and some power is out.
The National Weather Service forecast heavy rains and flash flooding would exist for the Northeast later on Monday.
At least eight people have died and dozens were injured after storms triggered tornadoes and flooding across several southern U.S. states.
As a result of the storm organizers for the Masters golf tournament at Georgia's Augusta National Golf Club moved up tee times Sunday. At least 30 people were reportedly injured and killed, including some soldiers, who were hit with flying debris.
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Now the storm turns toward the Midwest and East Coast.
The storm's cold front brought snow to Chicago on Sunday, with 1 to 3 inches (2.5-7.6 cm) reported in central IL.
According to CNN, the death toll includes a county worker in Alabama, a Texas woman whose mobile home was destroyed and two children in east Texas who were struck by a tree that fell on their vehicle.
Kayla Easterling outside her church, with several damaged buildings.
In addition, three people were killed when a private jet crashed in MS on Saturday, but Bryant said it was uncertain whether it was caused by the weather.
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Heavy rains and storms raked MS into the night Saturday as the storms moved east.