Awwal 24, 1432 /April 28, 2011, SPA -- Dozens of massive tornadoes tore a town-flattening streak across the South, killing at least 250 people in six states and forcing rescuers to carry some survivors out on makeshift stretchers of splintered debris. Two of Alabama's major cities were among the places devastated by the deadliest twister outbreak in nearly 40 years, according to AP. As day broke Thursday, people in hard-hit areas surveyed obliterated homes and debris-strewn streets. Some told of deadly winds whipping through within seconds of weather alerts broadcast during the storms Wednesday afternoon and evening "It happened so fast it was unbelievable," said Jerry Stewart, a 63-year-old retired firefighter who was picking through the remains of his son's wrecked home outside Birmingham. "They said the storm was in Tuscaloosa and it would be here in 15 minutes. And before I knew it, it was here." He and his wife, along with their daughter and two grandchildren, survived by hiding under their front porch. Friends down the street who did the same weren't so lucky - Stewart said he pulled out the bodies of two neighbors whose home was ripped off its foundation. Alabama's state emergency management agency said it had confirmed 162 deaths, while there were 33 in Mississippi, 33 in Tennessee, 13 in Georgia, eight in Virginia and one in Kentucky. President Barack Obama said he would visit Alabama Friday to view damage and meet with the governor and families devastated by the storms. Obama has already expressed condolences by phone to Gov. Robert Bentley and approved his request for emergency federal assistance. The National Weather Service's Storm Prediction Center in Oklahoma, said it received 137 tornado reports into Wednesday night. The storms forced authorities in some places into makeshift command posts after their headquarters lost power or were damaged, and an Alabama nuclear plant was using backup generators to cool units that were shut down. Some of the worst damage was in Tuscaloosa, a city of more than 83,000 that is home to the University of Alabama. Neighborhoods there were leveled by a massive tornado that barreled through late Wednesday afternoon. "When I looked back, I just saw trees and stuff coming by," said Mike Whitt, a resident at DCH Regional Medical Center who ran from the hospital's parking deck when the wind started swirling and he heard a roar. On Thursday morning, he walked through the neighborhood next to the hospital, home to a mix of students and townspeople, looking at dozens of homes without roofs. Household items were scattered on the ground - a drum, running shoes, insulation, towels, and a shampoo bottle. Streets were impassable, the pavement strewn with trees, pieces of houses and cars with their windows blown out. Back from an aerial tour Thursday morning, Tuscaloosa Mayor Walter Maddox said the tornado tore a streak of "utter destruction" through the city. There were at least 36 people dead in the city's police jurisdiction, and searches continue for the missing. "We have neighborhoods that have been basically removed from the map," he said. Because the city's emergency management building was destroyed, authorities are using Bryant-Denny Stadium at the University of Alabama as a command post. University officials said there didn't appear to be significant damage on campus, and dozens of students and locals were staying at a 125-bed shelter in the campus recreation center. The storm system spread destruction from Texas to New York, where dozens of roads were flooded or washed out. The governors of Alabama, Mississippi and Georgia issued emergency declarations for parts of their states. Tornado watches were in effect Thursday for some areas from Georgia to Maryland. Dave Imy, a meteorologist with the prediction service, said the deaths were the most since a tornado outbreak killed 315 people in 1974. In Alabama, where as many as a million people were without power, Bentley said 2,000 national guard troops had been activated and were helping to search devastated areas for people still missing. He said the National Weather Service and forecasters did a good job of alerting people, but there is only so much that can be done to deal with powerful tornadoes a mile (1.6 kilometers) wide. The storm also forced the Browns Ferry nuclear power plant west of Huntsville to shut down its three units because of damage to the utility's transmission lines, the Tennessee Valley Authority said. Diesel generators were being used to cool the reactors. The safety systems operated as needed and the emergency event was classified as the lowest of four levels, the Nuclear Regulatory Commission said. The storms came on the heels of another system that killed 10 people in Arkansas and one in Mississippi earlier this week. Less than two weeks earlier, a smaller batch of twisters raced through Alabama, touching off warning sirens, damaging businesses and downing power lines in Tuscaloosa, but there were no deaths there then.