Reena Roy reports on the millions of Americans facing flood threats in Southern California and Brittany Bell is tracking the frigid cold and lake-effect snow; Tom Soufi Burridge has the latest after flames ripped through a bar during a New Year's celebration in a ski resort town in the Swiss Alps, killing about 40 people and injuring more than 100; Selina Wang reports after health care subsidies expired for over 20 million Americans, with costs set to skyrocket after Congress failed to reach a deal; Ike Ejiochi has details on the mystery in Ohio after a dentist and his wife were found shot to death inside their home; and more on tonight’s broadcast of World News Tonight with David Muir.

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