Hi laz,
We have driven from frozen MN to FL for many a Christmases. MIL lives there. Anyways, yes there can be storms along the way. Most are not big deal for northerns. We hig a big one in ILL one year. Snowed 6" the night we stopped in Bloomington, ILL. My husband left the snow on the roof to see how long for it to melt off. We scared people who were traveling north when they saw the snow on the roof in a Kentucky rest stop. Mostly we try to watch the weather channel alot! They only area you really neeed to be the most concerned in the pass throught the mountains north of Chattanooga, TN. They can get wicked ice storms there and the road get very icy. We have lucked out. Other then the one storm in Bloomington, we had great traveling weather. Also most Christmases, FL weather in the mid 80's.
Have fun