taylor.thanks for 3 3 3 3 millions of americans are hitting the road or taking to the skies today. it s expected to be one of the busiest travel days of the holiday season. instead of snow. though. as c - b - s news correspondent don champion shows us. a lot of folks along the eastern part of the country could be delayed by severe thunderstorms . 3 (pkg) -nats-beep from the roads. -nats- .to the friendly skies. people across the u-s are making their way home for the holidays: (sot mos) ?? for the first time triple-a predicts the number of people making a journey 50 miles or more between christmas and new year s - will top 100 million. marking it the growth. (sot mos) (standup: don champion/ cbs news/ new york, ny) the holiday rush comes as severe thunderstorms and tornadoes threaten parts of the south to the ohio valley. (sot eric fisher/ meteorologist) we ve got cold dry air coming down across the plains and very unusually warm moist air that s being lifted up out of the