heartbreaking. that's how the mayor of canton, texas describes the aftermakt of a deadly tornado that slammed into the town. >> going to hit the power lines. my god. >> this monster twister, one of at least three that hit east of dallas yesterday. it was part of a storm system blamed for at least eight deaths across the south and the midwest. you can see the destruction. more than 30 million people are now under flash flood watches and watches today as the severe weather moves east. >> the city of canton, texas, just east of dallas is perhaps the hardest hit area here. authorities there continue to go door to door making sure that they didn't miss any survivors. there was some concern the death toll of at least four people confirmed dead in the city could