Storms in the South, snow in the North — and a map that shows every delay

Holiday travel is underway, and the weather is already throwing curveballs across the country. A strong system in the South is driving heavy rain and thunderstorms from Texas to Mississippi, with a slight risk of severe weather reaching into the Tennessee Valley.

According to the National Weather Service , flash flooding is possible in the Texas Hill Country, and storms will shift east on Tuesday, bringing rain from Atlanta to New York and likely delays at major hubs.

Farther north, a quick-moving clipper system is spreading 3 to 6 inches of snow across the northern Plains and into the Great Lakes through Wednesday. Blowing snow and gusty winds could make roads slick on I-94 and I-29 and complicate flights in Minneapolis, Chicago and Detroit.

In the West, the Pacific Northwest stays st