December 13: Latest on tornado outbreak. New study on boosters for Omicron defense. Time Magazine’s editor-in-chief on Person of the Year pick.

The latest on that tornado outbreak in the Midwest and South — we’re speaking with Mayfield, Kentucky’s, mayor Kathy Stewart O’Nan, and Al Roker has more on what triggered the outbreak and what’s ahead. Plus, Kate Snow is in Kentucky with the latest on the ongoing rescue effort at the site of a candle factory, and she’s speaking with survivors. Also, encouraging news on the effectiveness of boosters — this, as cases continue to trend in the wrong direction across the country. And, Time Magazine’s editor-in-chief, Edward Felsenthal, chats with Savannah Guthrie and Hoda Kotb about Time’s Person of the Year pick.