A federal emergency has been declared in Mississippi after a series of powerful storms and tornadoes ripped through the region over the weekend. At least 26 people were killed, leaving thousands displaced as rescue workers continue to sift through the debris and search for survivors. A supercell storm system rolled through the Southeast producing severe weather across the region with at least 10 confirmed tornadoes touched down on Friday night alone. And while each of those tornadoes produced serious damage, one in particular brought the most destruction, staying on the ground for more than an hour, and traversing 170 miles.