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The Washington State Department of Transportation has released its charts on the busiest travel times for the Thanksgiving travel season.

Complicating matters for some drivers headed over the Cascade mountain passes will be heavy snow expected on Sunday.

Check out this gallery for all the charts, but here it is in a nutshell.

Drivers headed eastbound over Snoqualmie Pass should expect stop-and-go traffic between 1 p.m. and 5 p.m. Wednesday. On Sunday, expect stop-and-go traffic in both directions between 1 p.m. and 5 p.m., but that could be made worse as the snow levels drop to 3,000 feet, according to KING 5 Meteorologist Rich Marriott.

Many drivers may return home on Sunday to avoid the snow, so expect higher volumes on Saturday as well.

Same goes for US 2 over Stevens Pass. Expect moderate-to-heavy-traffic in the late morning-to-early afternoon hours, but it could be worse if the snow becomes a problem.

Interstate 5 between Tacoma and Olympia is always a tough go even when it s not the holiday season. WSDOT says to expect stop-and-go traffic southbound between 10 a.m. and 9 p.m. Wednesday. More stop-and-go conditions can be expected in the late morning and early afternoon on Thursday through Sunday.

If you re driving to or from the Canadian border on I-5, expect moderate to heavy traffic most days in the late morning to evening.

Mobile apps to help you stay updated on the go:

WeatherCaster App

Seattle Traffic App

KING 5 App

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