Last Updated 12:59 p.m. ET
Across the South, volunteers have been pitching in as the death toll from Wednesday's storms keeps rising.
At least 340 people were killed across seven states, including at least 249 in Alabama, as the storm system spawned tornadoes through several states. It was the largest death toll since March 18, 1925, when 747 people were killed in storms that raged through Missouri, Illinois and Indiana.
As a result of this week's devastation, more than a million people are without electricity.
Damage could exceed $5 billion, and cleanup will go on for months.
1,500 Alabama National Guardsmen have been called in to keep order.
CBS News correspondent Dean Reynolds said across much of the tornado zone devastation stretches for miles - block after block of homes torn apart by the powerful twisters - a reality the president and his wife saw firsthand yesterday in Tuscaloosa, Ala.
"This is something I don't think anybody has ever seen before," President Obama said. "We're going to make sure you're not forgotten."
The University of Alabama stadium has been turned into a makeshift shelter for the thousands of homeless.
Tuscaloosa Mayor Walt Maddox said, "I would classify it as a nightmare."
That nightmare, said Reynolds, could go on for days.
Utility companies say they may not have power restored before the middle of next week.
For fire department crews, the mission has now changed from rescue and recovery, to recovery.
Throughout Alabama, members of these tight-knit communities have rallied together, providing any assistance they can.
In Pratt City, Ala., volunteers jumped out of the back of a beat-up truck to hand out water, groceries, even hot dogs to beleaguered residents of this storm-ravaged Birmingham suburb.
Down the road, dozens more volunteers transformed the local elementary school into the ultimate community pit stop. One room was devoted to storing bread, another to sorting donated clothing. A doctor set up shop in one part of the building, and volunteers staffed the grill in front while college students formed a neat assembly line to unload trucks stuffed with fresh supplies.
"I'm from the community but my house wasn't damaged, so I had to help," said Elsie Bailey, who was working in a room doling out men's clothing. "We were so amazed at the destruction that I just wanted to help. People are really stepping up, coming through."
Across the South, volunteers started pitching in almost as soon as the storms passed through. They ditched their jobs, shelled out their paychecks, donated blood and even sneaked past police blockades to get aid to some of the hardest-hit communities struck by the deadliest tornado disaster since 1925.
"We're part of the community, and we're called to reach out and help people," said Ken Osvath of the Church of the Highlands, one of an untold number of volunteers who handed out supplies to victims in Alabama.
The volunteers were filling the void left by emergency safety workers whose infrastructure was devastated by the tornado disaster. Emergency buildings were wiped out, bodies were being stored in refrigerated trucks, and authorities were left to beg for such basics as flashlights. In one neighborhood, the storms even left firefighters to work without a truck.
The death toll from Wednesday's storms reached 339 across seven states, including at least 248 in Alabama, making it the second-deadliest day for a twister outbreak in U.S. history. The largest death toll ever was on March 18, 1925, when 747 people were killed in storms that raged through Missouri, Illinois and Indiana.
Hundreds if not thousands of people were injured Wednesday 990 in Tuscaloosa alone and as many as 1 million Alabama homes and businesses remained without power.
The scale of the disaster astonished President Barack Obama when he arrived in the state Friday.
"I've never seen devastation like this," he said, standing in bright sunshine amid the wreckage in Tuscaloosa, where entire neighborhoods were flattened.
Mayor Walt Maddox called it "a humanitarian crisis" for his city of more than 83,000, but he said the situation would have spiraled out of control if not for the volunteers who worked to quickly get supplies for people.
Shamiya Clancy is one of those who was in desperate need of shelter after the homes where she and her family lived in the Alberta City neighborhood were wiped out. They're now pooling their resources clothes, money, food, whatever they can scrounge but none of them have anywhere else to go.
A stuffed bear that her husband gave her on Valentine's Day this year was the sole belonging she recovered when she sifted through the rubble. She was hoping to find family photos.
"If I could have found one picture, I'd be OK. I'd feel a little better," she said.
Bishop Robert J. Baker of the Catholic Diocese of Birmingham approached them as they prepared to leave, asking about their most pressing needs.
"Where do they start here? This is total devastation," Baker said.
In Rainsville, a northeast Alabama town devastated by the storms, people in cars stopped to offer bread, water and crackers to residents picking through what was left of their belongings. A radio station broadcast offers of help, a store gave away air mattresses and an Italian restaurant served free hot meals. A glass shop offered to replace shattered windows for free.
Emergency services were stretched particularly thin about 90 miles to the north in the demolished town of Hackleburg, Ala., where officials were keeping the dead in a refrigerated truck because of a shortage of body bags. At least 27 people were killed there and the search for missing people continued, with FBI agents fanning out to local hospitals to help.
But in Hackleburg as in Tuscaloosa, emergency workers had more to do than aid the victims. People have looted a demolished Wrangler jeans distribution center, and authorities locked up drugs from a destroyed pharmacy in a bank. Fire Chief Steve Hood said he desperately wanted flashlights for the town's 1,500 residents because he doesn't want them using candles that could ignite their homes.
Tuscaloosa's emergency management center was destroyed, so officials used space in one of the city's most prominent buildings the University of Alabama's Bryant-Denny Stadium as a substitute before moving operations to the Alabama Fire College. Less than two weeks ago, the stadium hosted more than 90,000 fans for the football team's spring intrasquad Red-White Game.
In Tuscaloosa, city employee Gene Hopkins was delivering loads of supplies to different parts of the city when he took a break to help Barbara Deerman, a restaurant owner at the strip mall, board up her shattered front door.
"I appreciate this," Deerman said. "I'll give you a free meal when we get this back up."
Other volunteers set up a makeshift relief station at a parking lot in Alberta City neighborhood, where scores of homes and businesses have been reduced to twisted piles of metal, glass and wood. It was staffed by a mix of city employees, church members, National Guard troops and supermarket workers, and residents lined up for water, food and other basic supplies.
"We've got people who wanted to get in here and help, but they couldn't get in earlier," said relief station volunteer Doug Milligan, a Tuscaloosa native who is principal of a high school in nearby Woodstock, Ala. "We didn't know what to do, but we're going to do something."
Milligan had to sneak past the tight network of police blockades cordoning off the neighborhood. He figures he got by because he wore a T-shirt that read: "Bibb County Red Cross."
"I didn't tell them it's only because I ran a 5K," he said.