Video of devastating flood with 40+ Americans missing floors Erin Burnett: 'Unforgettable'

CNN's Erin Burnett was floored on Wednesday's broadcast of "OutFront" by video of a catastrophic flash flood in Nepal that has left at least 150 people dead and more than 47 Americans missing. Reports indicate that the flooding was caused by a half-mile-wide chunk of a glacier breaking off. CCTV cap...