At least 107 people are dead across six counties in catastrophic flash flooding in central Texas. NBC National News Correspondent Morgan Chesky is on the ground in Kerrville, Texas as rescue teams continue to comb through piles of debris in search of survivors.

As the Guadalupe River swelled from a wall of water heading downstream, sirens blared over the tiny river community of Comfort -- a last-ditch warning to get out for those who had missed cellphone alerts and firefighters going street-to-street telling people to get out.