Post-Thanksgiving travel will be treacherous in parts of the Great Lakes region on Sunday due to several feet of lake-effect snow, while biting cold temperatures sweep across a large swath of the United States.

Since it began early Friday morning, the lake effect storm has dumped several feet of snow in some areas. The snow fell at such an unrelenting pace that street crews have been unable to keep pace. Hundreds of holiday travelers were stranded on major highways Friday like i-90 and had to abandon their cars.

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While a lake-effect snow warning is in place for Erie County until Tuesday, the worst weather is likely Saturday, complicating Friday snowfall recovery.

More than 4 million people across five states were under winter storm alerts on Sunday as heavy lake-effect snow continued to bury the Great Lakes region, prompting emergency declarations and the deployment of National Guard troops to rescue stranded motorists.

Nearly two million people remain under lake-effect snow warnings through early Monday. CNN’s Polo Sandoval reports.

An intense lake effect is forecast through the rest of the weekend, causing as much as 1 to 2 feet of additional snow in some areas.