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 stormy, with rounds of lowland rain and mountain snow, while Utah and surrounding areas see seasonable temperatures and only light mountain snow.

Much of the East stays unusually warm ahead of a cold front, with highs from the 60s to the 80s before temperatures drop toward Thanksgiving.

Tracking delays

For travelers concerned about flight status, FlightAware’s “Misery Map” offers a real-time picture of nationwide delays and cancellations. The map color-codes major airports based on on-time performance and weather impacts, giving travelers a quick sense of whether delays are isolated or stacking up across the system.

Bottom line: Plan extra time, check your airline’s app frequently and watch tools like the Misery Map as you head out — especially Monday through Wednesday, when the highest impacts are expected.