Nov. 23 (UPI) -- National Weather Service forecasters warned Saturday that "messy" weather may impact Thanksgiving travel in the eastern half of the United States, including the potential for the coldest temperatures this season. As millions of Americans take to the roads and airports, the best potential for moderate to heavy precipitation during the mid-week period is across the Tennessee and Lower Ohio Valleys into the Appalachians and Mid-Atlantic, NWS forecasters said in their extended