Joplin, Mo., single deadliest tornado since 1950

Updated at 10:59 a.m. ET

JOPLIN, Mo. - A tornado that killed 117 people in Missouri was the single deadliest twister in the past 60 years, according to National Weather Service.

Gov. Jay Nixon's spokesman, Sam Murphey, said Tuesday morning that the death toll in Joplin had risen to 117.

Until this week, the single deadliest tornado on record with the National Weather Service in the past six decades was a twister that killed 116 people in Flint, Mich., in 1953.

The governor told Chris Wragge, co-anchor of CBS' "The Early Show," Tuesday morning that, weather permitting, rescue crews hoped to have combed over "every foot of this town" by 2 p.m. local time (3 p.m. Eastern).

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Nixon said he did not want to guess how high the death toll would eventually climb. But he said: "Clearly, it's on its way up."

There were glimmers of hope. CBS News correspondent Cynthia Bowers reports that at least 17 people have been pulled from the twisted rubble alive. Officials say, however, at least 130 are still unaccounted for.

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The weather service's records show more deaths have resulted from outbreaks of multiple tornadoes. On April 27, a pack of twisters roared across six Southern states, killing 314 people, more than two-thirds of them in Alabama. That was the single deadliest day for tornadoes since the National Weather Service began keeping such records in 1950.

The agency has done research that shows deadlier outbreaks before 1950. It says the single deadliest day that it is aware of was March 18, 1925, when tornadoes killed 747 people.

Sunday's killer tornado ripped through the heart of Joplin, a blue-collar southwest Missouri city of 50,000 people, slamming straight into St. John's Regional Medical Center. The hospital confirmed that five of the dead were patients — all of them in critical condition before the tornado hit. A hospital visitor also was killed.

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The tornado destroyed possibly "thousands" of homes, Fire Chief Mitch Randles told AP. It leveled hundreds of businesses, including massive ones such as Home Depot and Walmart.

Speaking from London, President Obama said he would travel to Missouri on Sunday to meet with people whose lives have been turned upside down by the twister. He vowed to make all federal resources available for efforts to recover and rebuild.

"The American people are by your side," Mr. Obama said. "We're going to stay there until every home is repaired, until every neighborhood is rebuilt, until every business is back on its feet."

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Craig Fugate, director of the Federal Emergency Management Agency, told NBC's "Today" show Tuesday that Mr. Obama has declared a disaster in the area, which means residents are eligible for his agency's assistance.

"We're here for the long haul, not just for the response," Fugate said.

Fugate, Nixon and Sen. Claire McCaskill were viewing the damage Tuesday by helicopter, Murphey said.

Much of Joplin's landscape has been changed beyond recognition. House after house was reduced to slabs, cars were crushed like soda cans and shaken residents roamed streets in search of missing family members.

The danger was by no means over. Fires from gas leaks burned across city. The smell of ammonia and propane filled the air in some damaged areas. And the forecast looked grim.

The April tornadoes that devastated the South unspooled over a three-day period starting in the Plains. The Storm Prediction Center in Norman, Okla., said a repeat could be setting up, with a possible large tornado outbreak in the Midwest on Tuesday and bad weather potentially reaching the East Coast by Friday.

"This is a very serious situation brewing," center director Russell Schneider said.

Early Tuesday, the center said there was a moderate risk of severe weather in central and southeast Kansas and southwestern Missouri, which could include Joplin. It raised the warning for severe weather in central Oklahoma, southern Kansas and north Texas to high risk indicating that tornadoes will hit in those areas.

The Storm Prediction Center also issued a high-risk warning before the deadly outbreak in the South in April.

Heavy rain fell from dark skies all day Monday, finally letting up only as night fell, and lightning was so frequent that it slowed the rescue and recovery effort, Randles said. A police officer from Riverside, Mo., who was helping with the rescues, was burned from a lightning strike and hospitalized. Another officer was slightly injured in a near-lightning strike but kept working.

The rainy, cool weather — the forecast called for an overnight low of 62 degrees — raised concerns about its effect on anyone still trapped in rubble. A whipping wind, perhaps strong enough to finish off homes left barely standing by the tornado, made things more dangerous for searchers and potential survivors.

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