The tiny community of Beauregard, near the Alabama-Georgia border, was beginning to mourn the 23 people confirmed killed by the storms, which included four children and seven people from one family, officials said on Tuesday.
There are fears that the death toll will rise. Dozens of people were hurt.
En route, the motorcade passed severely damaged homes, fallen trees and whole neighborhoods that had been destroyed.
Operation Blessing is expected to be in the tornado zone over the next couple of weeks to serve those affected.
Rescue efforts were halted overnight because of the dangers associated with searching in the dark.
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In its preliminary assessment, the NWS found the tornado had winds around 170 miles per hour and the NWS's Chris Darden told NBC News that the tornado was estimated to have spanned at least 24 miles in length.
The swath of destruction left by the storm was 0.4 kilometres wide and stretched for the "several miles that it travelled on the ground", according to Jones.
Footage of the aftermath shows snapped communications poles, roads littered with debris and wrecked houses. "And it's that old cliché that it sounds like a freight train coming, well that's what it sounded like". A large bar called the Buck Wild Saloon had had its roof torn off. Five tornadoes have been confirmed in Florida, and four more in SC.
Tornadoes were also reported in Walton County and Cairo in northern Florida. So far, his office has no reports of anyone with bad intentions.
One survivor lost seven members of his family, and warned that he may be facing "financial issues" because of multiple funeral costs. Coroner Bill Harris says he's confident donations will pay for them.
The family of a 6-year-old boy killed by a tornado in Alabama is picking through debris to recover his toys, photographs and other keepsakes to help them remember the child.
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The extent of the damage forced Alabama Mayor Kay Ivey to extend the State of Emergency first issued February 23, she said on Twitter.
"I had a friend who lost his life, and just my heart spoke", Stephanie Griffith tearfully told WVTM-TV as she dropped off supplies at a shelter in Lee County.
Alabama search and rescue teams on Tuesday were combing through the wreckage of houses flatted by weekend tornadoes, looking for seven or eight people who remained unaccounted for in the wake of the deadliest USA tornado outbreak since 2013.
Trump and his wife, Melania, held hands as they paused in front of each of the markers erected near a church serving as a makeshift disaster relief center for survivors of Sunday's twister. Warm air flows north from the Gulf of Mexico at the same time as storm systems are propelled into the south and mid-west by a southward dip in the jet stream.
NEW: Here are the names of the 23 Tornado victims in Beauregard Alabama, just released by officials.
Several tornadoes were confirmed throughout the state, and several people were injured in Talbotton, Georgia, after a unsafe storm hit the town.
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