Tornado Store News Today

Little rock, arkansas. >> reporter: an ef 1 tornado store through. it was the sound of the storm that woke up everybody up. nearly 7,000 people left without power. in st. louis, the rain came fast and was heavy. flooding streets and stranding cars. >> its more than what the drainage system can handle at one time. you have the flash flooding. >> reporter: more than 50 million people are at risk for tornados or wind damage. nbc bill is here with more. the severe weather outbreak. is the worst of...