While the western half of the county experiences above-average temperatures, a pattern flip will bring temperatures dipping across the Eastern U.S. later this week. On Thursday, more than 100 million people could see below-average temperatures, with highs 5 to 15 degrees below average. This cold air will extend from Florida all the way up to the Great Lakes. Atlanta, Nashville and Birmingham are expected to see temperatures in the mid 30s while Pittsburgh and Chicago will see temperatures in the mid 20s. By Friday, this cold air will expand to the Northeast. Watch to see what temperatures will look like in your city.