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A new round of ice and snow is descending on 15 states from ohio to alabama. our coverage begins with abcs brandi hitt. good morning, brandi. >> reporter: good morning, rob and sunny. this blast of cold air is now hitting the south where flights are already being canceled at airports, including nashville international. a deep freeze has now taken over one-third of the u.s. and creating conditions so dangerous, salt lake citys airport had to be shut down because planes were sliding down the icy r...