Storms also struck Birmingham, felling numerous trees that impeded emergency responders and those trying to leave hard-hit areas. Surrounding Jefferson County reported 11 deaths; another hard-hit area was Walker County in the far northwest part of the state with at least eight deaths. The rest of the deaths were scattered around northern Alabama.
The Browns Ferry nuclear power plant about 30 miles west of Huntsville lost offsite power. The Tennessee Valley Authority-owned plant had to use seven diesel generators to power the plant's three units. The safety systems operated as needed and the emergency event was classified as the lowest of four levels, the Nuclear Regulatory Commission said.
In Huntsville, meteorologists found themselves in the path of severe storms and had to take shelter in a reinforced steel room, turning over monitoring duties to a sister office in Jackson, Miss. Meteorologists saw multiple wall clouds, which sometimes spawn tornadoes, and decided to take cover, but the building wasn't damaged.
"We have to take shelter just like the rest of the people," said meteorologist Chelly Amin, who wasn't at the office at the time but spoke with colleagues about the situation.
She said the extent of the damage statewide is still unknown.
"I really think with the rising of the sun, we'll see the full extent of this," she said.
In Kemper County, Miss., in the east-central part of the state, sisters Florrie Green and Maxine McDonald, and their sister-in-law Johnnie Green, all died in a mobile home that was destroyed by a storm.
Johnnie Green's daughter-in-law said Florrie Green and McDonald owned mobile homes side-by-side, and Johnnie Green lived nearby. Johnnie Green was at one of the woman's homes at the time the storm hit.
"It's hard. It's been very difficult," Mary Green said. "They were thrown into those pines over there," she said, pointing to a wooded area. "They had to go look for their bodies."
In Choctaw County, Miss., a Louisiana police officer was killed Wednesday morning when a towering sweetgum tree fell onto his tent as he shielded his young daughter with his body, said Kim Korthuis, a supervisory ranger with the National Park Service. The girl wasn't hurt.
The 9-year-old girl was brought to a motorhome about 100 feet away where campsite volunteer Greg Maier was staying with his wife, Maier said. He went back to check on the father and found him dead.
"She wasn't hurt, just scared and soaking wet," Maier said.
Her father, Lt. Wade Sharp, had been with the Covington Police Department for 19 years.
"He was a hell of an investigator," said Capt. Jack West, his colleague in Louisiana.
In a neighborhood south of Birmingham, Austin Ransdell and a friend had to hike out after the house where he was living was crushed by four trees. No one was hurt.
As he walked away from the wreckage, trees and power lines crisscrossed residential streets, and police cars and utility trucks blocked a main highway.
"The house was destroyed. We couldn't stay in it. Water pipes broke; it was flooding the basement," he said. "We had people coming in telling us another storm was coming in about four or five hours, so we just packed up."
Not far away, Craig Branch was stunned by the damage.
"Every street to get into our general subdivision was blocked off. Power lines are down; trees are all over the road. I've never seen anything like that before," he said.
In eastern Tennessee, a woman was killed by falling trees in her trailer in Chattanooga. Just outside the city in Tiftonia, what appeared to be a tornado also struck at the base of the tourist peak Lookout Mountain.
Tops were snapped off trees and insulation and metal roof panels littered the ground. Police officers walked down the street, spray-painting symbols on houses they had checked for people who might be inside.
Mary Ann Bowman, 42, stood watching from her driveway as huge tractors moved downed trees in the street. She had rushed home from work to find windows shattered at her house, and her grandmother's house next door shredded. The 91-year-old woman wasn't home at the time.
"When I pulled up I just started crying," Bowman said.
Mohr reported from Choctaw County, Miss. Associated Press writers Jamie Stengle in Edom, Texas, Andrew DeMillo and Nomaan Merchant in Vilonia, Ark., Jack Elliott Jr. in Jackson, Miss., Anna McFall and John Zenor in Montgomery; Bill Fuller and Alan Sayre in New Orleans, Dorie Turner in Atlanta, Bill Poovey in Chattanooga, Tenn., and Terry Wallace in Dallas contributed to this report.
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