The coldest air of the season so far is set to arrive later this week for the Northern Plains-Midwest and into parts of the South and East. The threat for heavy lake effect snow across the Great Lakes continues to increase as well.

Mother Nature is about to serve up some unappetizing conditions for the millions of Thanksgiving travelers: sloppy weather, snow, the coldest temperatures since February and a potentially disruptive storm are on the way through the holiday weekend. Here’s a day-by-day look at what to expect this week.

Winter weather could snarl travel plans for the millions of Americans traveling for the Thanksgiving holiday this year.