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.

In Erie County, Ohio, a lake-effect snow warning is in place until 7 p.m. on Tuesday. Between 10 and 20 inches of heavy snow accumulations are expected in the north of the county, while between 12 and 24 inches are expected in the south.

Western New York has been plagued with at least three feet of snow in some areas, amid lake-effect snow warnings. The National Weather Service office in Buffalo, New York, expected some snowfall totals to top 4 feet by Monday,