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Gets hit by an ef-4 tornado twice. >> i am so thankful that god was with me. >> reporter: both times. the woman with a one in a million charm. >> still taking that picture. i know you. i am grinning. >> reporter: grinning despite her one in 100 trillion odds. nancy tells us she wants to rebuild again. even though she was the one in 100 trillion, people like her and here in oklahoma, most folks realize devastation like this can happen. they're part of tornado alley. there is a reason that tornados happen more here than almost everywhere in the world. look at this map. you get moisture from the ...

To touchdown and take direct aim at his home and family. >> way over there. >> reporter: his wife, kayla a,e storm shelter, their bunker. we want to find him. there was jason in his front yard, no home left. there was his family and he showed us why. taking us into his concrete storm shelter where they were huddled. you could see the pressure of the tornado against the metal here? >> metal was popping in and out. >> reporter: the metal door buckling under pressure of the tornado. you have lanterns? >> we have lanterns. and another thing is our light popped while we were in here. >> reporter: w...

Story that perhaps no one else in the world can tell. she has lost her home to a tornado twice. both right here on this same spot. this is not your first time? >> no. i was here in '99. >> reporter: here in 1999, that infamous day, may 3rd when the fastest winds ever recorded inside a tornado topped 300 miles per hour. trampling an 18-mile path through moore. that stunning resemblance to monday's path. and right there, where the deadly path's cross, ms. davis' house. this was nancy's house before. this is it now. this is the cellar where they rode it out and survived. twice. two times in that ...

We begin this half-hour with the latest from the tornado zone. the fire chief in moore says he is 98% certain that no one is still trapped in the rubble. each house in the city has been searched at least once. >> 24 people are confirmed dead with hundreds being treated at the hospital. after two schools were leveled, classes are canceled in moore the rest of the year. abc's david muir has more. >> my god! >> reporter: we learn that monstrous tornado was in some places even stronger more dangerous than first thought. a promise from authorities here, to search every home here in moore, oklahoma,...

>> reporter: this video of moore tornado was taken through a crack in one of these. a safe room. researchers have shown us that houses can't show up to tornado wind. safe rooms above ground built into your house or underground in the backyard can save your life. the safe rooms are subjected to their own tests to with stand winds up to 250 mile an hour. canon fired wood. one company dropped bricks, lumber and a car on its shelter. >> there are above ground and below storm shelters that offer near absolute occupant protection from the worst case tornado. >> reporter: many homes don't have baseme...