A powerful winter storm that hit the U.S. Southeast over the weekend knocked out power for more than 190,000 customers in North Carolina, officials said on Sunday.

Authorities urged residents to stay off the roads as snow, sleet, and freezing rain were expected to continue into Sunday, the National Weather Service said.

The agency reported between four and 12 inches (10 to 30 cm) of snow in some areas and warned about continuing snowfalls which could bring as much as a foot and a half (46 cm) from western and northern North Carolina to southwest Virginia.

The storm prompted some 1,000 flight cancellations at Charlotte/Douglas International Airport, the sixth-busiest airport in the country, according to flight-tracking website FlightAware.

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