u.s. with the storm system moving through. it may mess up your holiday weekend travel plans. here is meteorologist derek van dam. >> good morning, alison and dave. unfortunately mother nature has terrible timing this year. we have the busiest travel day of the year taking place today and the major east coast storm causing travel headaches from new england to the southeast. you see on the map all the rain and storms associated with the system from the ohio river valley and atlantic coastline. there could be travel delays at the airports as well. we have 70 million americans under flood watches this morning including boston and philly. we could see 2 to 4 inches of rainfall in the next 24 hours. just outside of new york city where you see the shading of yellow and orange. in terms of temperatures, a roller coaster. one more mild day for the