brazil. employees of the mining company were eating lunch friday afternoon when the dam ruptured. the death toll is still rising as rescuers continue to dig through several feet of mud to search for survivors. >> it's distressing, ma maddeni. time is passing. it's been 24 hours already. i don't want to think he's under the mud. >> hundreds of people have been reported missing. still no word on what caused the collapse. the upper midwest braces for a dangerously cold winter storm. the region could see record temperatures this weekend with wind chills hitting 40 degrees below zero. meteorologist adam klotz is tracking the arctic blast in the fox extreme weather center. >> that is scary to hear but you know what, that's what's possibly on the way, certainly colder weather. these are some of the temperatures we're looking at, just the very beginning of this. feels like 1 degree in chicago, a little colder to the north.