we are hours away from the highly anticipate d debate on cnn. cnn's kyung lah is live in colorado state, arizona. kyung, the situation? >> reporter: about a mile downstream from where those cars were swept away by sudden flash floods. you can see that heavy machinery right over my shoulder. they're moving very, very quickly. they're digging through heavy mud, rocks, broken twigs, looking for several that are missing. and what makes all of this so desperate and heartbreaking is that the missing are mothers and children. >> this is the front yard. >> dramatic video this morning, showing a massive and deadly flash flood ripping through a small town on the arizona/utah border.