Thanksgiving week storm threatens cross-country holiday travel: Latest forecast

A major storm is moving across the country as millions of Americans hit the road and head to the airport for Thanksgiving.

Here's what you need to know:

On Friday, the storm is bringing rain and gusty winds to the West Coast, including the San Francisco area.

On Saturday, the rain will move into Oregon and Washington, as well as Southern California, where thunderstorms and rough winds are possible.

By Sunday, the system will reach the Plains. Heavy rain and thunderstorms are forecast for Oklahoma and Texas, including Oklahoma City and Dallas.

By Monday, the storm will hit the Gulf Coast with severe thunderstorms, damaging winds and large hail possible from Louisiana to Alabama.

By Tuesday and Wednesday, as Thanksgiving travel hits its height, the storm will be spreading heavy rain and potential flash flooding along the Interstate 95 corridor from Washington, D.C., to Boston.

Parts of northern New England and upstate New York may see some snow.

This cross-country storm comes as the Transportation Security Administration said it expects its busiest holiday season ever.

The busiest and most expensive days to fly before Thanksgiving will be Tuesday, Nov. 21, and Wednesday, Nov. 22, according to AAA.

The busiest day on the roads is expected to be Wednesday, Nov. 22, according to transportation analytics company INRIX. Drivers should leave home in the morning or after 6 p.m. to avoid the heaviest traffic, INRIX said.