Tornadoes Touch Down in Denver

DENVER - AUGUST 29: Two tornado funnels touch down close to downtown during a thunderstorm August 29, 2002 in Denver, Colorado. The August 30 forecast for Colorado calls for clear skies. (Photo by Robert Laberge/Getty Images).

Violent Storms Kill 24 In North Carolina

RALEIGH, NC - APRIL 17: Family friend, Jenn Zezza, finds a family portrait in a home on Serendipity Drive, in the McKinley Mill subdivision, after it was flattened by a tornado on April 17, 2011 in Raleigh, North Carolina. Multiple tornados tore through North Carolina on April 16, killing at least 43 people. (Photo by Sara D. Davis/Getty Images)

Violent Storms Kill 24 In North Carolina

ELM GROVE, NC - APRIL 19: A wondering rooster and chickens parade through a property with tornado damage on April 19, 2011 in Elm Grove, North Carolina. April 16th tornadoes tore through the farming communities of Bertie County taking with it crops and farm animals. (Photo by Sara D. Davis/Getty Images)

Violent Storms Kill 24 In North Carolina

ELM GROVE, NC - APRIL 19: A rooster runs through a property with tornado damage on April 19, 2011 in Elm Grove, North Carolina. April 16th tornadoes tore through the farming communities of Bertie County taking with it crops and farm animals. (Photo by Sara D. Davis/Getty Images)

Tornado Rips Through St. Louis Airport

ST. LOUIS, MO - APRIL 22: Airport employees walk past damage at Lambert International Airport's Terminal One April 22, 2011 in St. Louis, Missouri after a storm caused extensive damage to the airport. According to a spokesperson for the City of St. Louis, 4 people were taken to the hospital as a result of the storm damage at the airport. (Photo by Whitney Curtis/Getty Images)

Tornado Rips Through St. Louis Airport

ST. LOUIS, MO - APRIL 22: Airport employees walk past damage at Lambert International Airport's Terminal One April 22, 2011 in St. Louis, Missouri after a storm caused extensive damage to the airport. According to a spokesperson for the City of St. Louis, 4 people were taken to the hospital as a result of the storm damage at the airport. (Photo by Whitney Curtis/Getty Images)

Mayfield Tornado

FILE PHOTO: Funel cloud forms from a tornado at Mayfield, Oklahoma May 16, 1977. (photo by NOAA)

Union City Tornado

FILE PHOTO: Funel cloud forms from a tornado at Union City, Oklahoma May 24, 1973. (photo by NOAA)

Small Oklahoma Town Deals With Aftermath Of Devastating Tornado

PICHER, OK - MAY 14: A lead contaminated chat pile backdrops (L-R) Terri Evans of Tuscaloosa, Ala. helps her sister Sherri Frazier recover items from Frazier's home that was destroyed Saturday by a tornado that hit the small town of Picher, Okla. May 14, 2008. The EF-4 tornado, with winds of 166 to 200 mph., ripped through the town on May 10th killing 7 people. Many residents in the lead contaminated town were already going through buyouts from the federal government, which makes rebuilding unlikely for most. (Photo by Brandi Simons / Getty Images)

Tornadoes Rip Through Alabama

TUSCALOOSA, AL - APRIL 28: In the aftermath of a severe tornado, Kelly Giddens (right) helps University of Alabama law student Daniel Hinton (left) remove belongings from his destroyed home on April 28, 2011 in Tuscaloosa, Alabama. As of 8am, 131 deaths were accounted for in Alabama. The tornado that touchdown in Tuscaloosa is estimated to be one mile wide. (Photo by Jessica McGowan/Getty Images)

Tornadoes Rip Through Alabama

TUSCALOOSA, AL - APRIL 28: Businesses and homes near downtown Tuscaloosa sit destroyed in the wake of a tornado on April 28, 2011 in Tuscaloosa, Alabama. As of 8 a.m., at least 131 deaths were accounted for in Alabama. The tornado that touchdown in Tuscaloosa is estimated to be one mile wide. (Photo by Jessica McGowan/Getty Images)

Tornadoes Rip Through Alabama

TUSCALOOSA, AL - APRIL 28: In the aftermath of a severe tornado, Tuscaloosa Department of Transportation employee Casey Wallace tries to clear a road off 15th Street of power lines on April 28, 2011 in Tuscaloosa, Alabama. As of 8 a.m., at least 131 deaths were accounted for in Alabama. The tornado that touchdown in Tuscaloosa is estimated to be one mile wide. (Photo by Jessica McGowan/Getty Images)

Tornadoes Rip Through Alabama

TUSCALOOSA, AL - APRIL 28: In the aftermath of a severe tornado, debris from homes in the Cedar Crest neighborhood that were destroyed lies on the lawns on April 28, 2011 in Tuscaloosa, Alabama. As of 8 a.m., at least 131 deaths were accounted for in Alabama. The tornado that touchdown in Tuscaloosa is estimated to be one mile wide. (Photo by Jessica McGowan/Getty Images)

Tornadoes Rip Through Alabama

TUSCALOOSA, AL - APRIL 28: In the aftermath of a severe tornado, residents wander the steets near downtown Tuscaloosa surveying the damage on April 28, 2011 in Tuscaloosa, Alabama. As of 8 a.m., at least 131 deaths were accounted for in Alabama. The tornado that touchdown in Tuscaloosa is estimated to be one mile wide. (Photo by Jessica McGowan/Getty Images)