National Weather Service
A low pressure system will develop today in the western Gulf of Mexico and move northeast to the panhandle of Florida by noon Saturday. Rain will move northward from the Gulf region on Saturday and overspread all of Middle Tennessee Saturday night. The atmosphere across Middle Tennesse will be too warm for any chance of snow with this system. The rain will end from the west during the day Sunday.
Above image showing surface pressure/precip fields at 6 pm cst Saturday Jan 16, 2010
Above image showing surface pressure/precip fields at noon Sunday Jan 17, 2010Images from NWS/NASHVILLE TN/AWIPS SYSTEM