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Why was the Mississippi tornado so destructive?

More storms feared after Mississippi tornado

'My uncle's trailer was flattened - he was inside' Video, 00:00:38'My uncle's trailer was flattened - he was inside'

Governor 'damn proud to be a Mississippian' Video, 00:00:52Governor 'damn proud to be a Mississippian'

Tornado-hit high street 'all gone' Video, 00:00:52Tornado-hit high street 'all gone'

Rescue efforts under way after tornado devastates town

In pictures: Mississippi tornado devastates town

What causes a tornado? Video, 00:00:38What causes a tornado?

Devastation after Tornado rolls across Mississippi. Video, 00:00:32Devastation after Tornado rolls across Mississippi

What is Tornado Alley? Video, 00:01:02What is Tornado Alley?

Rare tornado hits Los Angeles area. Video, 00:00:57Rare tornado hits Los Angeles area

Police dog rescued from car before Texas tornado strikes. Video, 00:00:53Police dog rescued from car before Texas tornado strikes

Cameras show tornado ripping through Texas town. Video, 00:01:29Cameras show tornado ripping through Texas town

Winter storm bears down on millions in US

Texas hit by tornado as storms sweep the US. Video, 00:00:51Texas hit by tornado as storms sweep the US

Rescuers hunt for tornado survivors in southern US

Deadly tornadoes sweep through Alabama. Video, 00:01:05Deadly tornadoes sweep through Alabama

Severe weather causes havoc across the US. Video, 00:00:45Severe weather causes havoc across the US

Powerful US storm brings 'catastrophic damage'

'We just prayed': Tornadoes sweep across US south. Video, 00:00:59'We just prayed': Tornadoes sweep across US south

Deadly winter storm barrels east across US

Winter storm batters parts of US. Video, 00:01:02Winter storm batters parts of US