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We won't know for years exactly what all happened until somebody's master thesis figures it all out. let's go through things that are different this year than in a normal year. this is a normal jet stream. normal pattern. how is 2011 spring different? it's colder than normal on the plains. this is a record snow pack. there were 72 feet of snow in the alpine meadows. cold air across the northern plains. every time a cold front came down it was colder than it should have been. that cold air digs under and pushes warm air up and this has been an historic drought in texas. many of the storms shoul...

What all happened until somebody's master thesis figures it all out. let's go through things that are different this year than in a normal year. this is a normal jet stream. how is 2011 spring different? it's colder than normal on the plains. this is a record snow pack. there were 72 feet of snow in the sierra at alpine meadows. cold air across the northern plains. every time a cold front came down it was colder than it should have been. that cold air digs under and pushes warm air up and this has been an historic drought in texas. many of the storms should have been in texas. but if the air i...

This is a hook echo, a monster cell. but it wasn't a tornado on the ground until it got right there. when the tornado got on the ground it ripped through joplin, missouri, got bigger and bigger. at some point in time at 200 miles per hour, even if you are in your safe spot in your house, if you are not under ground in a storm shelter you can't survive it. >> we have seen so many tough storms this season. is there something about this season or something about the particular storms that we are just unlucky? this one hit joplin, another hit tuscaloosa. >> a few things that are different. we won'...

what's happening. that's ahead. we will have the latest on this developing story in a few minutes from now. president obama is back at the white house of a spending several hours in joplin, missouri. it was exactly a week ago that an f-5 tornado ripped through the city killing people in minutes. 5:41 central time there was a moment of silence marked by the precise instant that tornado hit. our dan traveled with the president to joplin and dan, a tough job for the president to try to lift spirits of a being amongest the people but seeing this disaster first-hand. >> this is a presid...

>> reporter: battle hardened storm chasers in awe of nature's power. >> oh, my gosh. this is awful. dude, the trees are debarked. >> reporter: residents running for every anywhere they could. >> everybody get down, all on the ground. >> reporter: in a crowded convenience store, some 20 people hunkering down in a darkened commercial refrigerator. >> can we go in the cooler? [ screaming ] >> go! >> oh, dear heaven. >> god! >> reporter: at the same time a security camera in a nearby frozen yogurt shop catches the chaos. workers moving customers to the back and then -- everything goes fl...