buildings sustaining significant damage. that includes one of the city s main hospitals. the national guard on patrol with a state of emergency in effect. andres cue teams they keep searching today, this afternoon, all through the day for survivors. joplin, missouri, the latest victim of a volatile wave of turbulent springtime weather. brian todd in the thick of it. reporter: drew, rescue teams are combing through grid by grid, house by house in this city. the houses that are left are severely damaged, but frankly in this part of the city not many houses are left. you mentioned about 1/3 of the houses in this downtown area were severely damaged. by that you can take to mean flattened. behind me you can see the wreckage of some of them that is left. now the weather is complicating things as these teams go through the grids of this city on foot mostly and pick through this. the lightning has been rolling in. thunder, rain, all day long. it has made their job, much, much diffi