Two Ohio siblings are being hailed as heroes after rushing to the aid of their school bus driver, who suffered a medical emergency and was unable to breathe. Mola Lenghi has more. https://abcnews.link/qKFScSv | ABC World News Tonight with David Muir

Whiteout conditions are slamming the Midwest, causing blizzard warnings and wind gusts up to 50mph. As the storm heads across the country, parts of the Northeast are preparing for icy conditions amid holiday travel. Dani Beckstrom has the forecast. https://abcnews.link/JIoobR9 | ABC World News Tonight with David Muir