Get ready for the first real taste of fall for millions across the eastern half of the country, as a powerful cold front sends temperatures plummeting. Many across the South and East will feel temperatures 15 to 20 degrees below average. Lows on Saturday morning will drop to the 30s for much of the Midwest and Great Lakes, while the South will get down to the 40s. Watch this video to see how cold it will be where you live.