A heavy mix of snow and sleet that swept across parts of the South is expected to melt and then freeze, making for slippery road conditions through Sunday, officials said.

The storm on Friday struck areas unaccustomed to such winter weather, prompting flight cancellations, school closures and official warnings to stay off the roads when possible.

A winter storm warning that stretched from eastern Oklahoma to Virginia was discontinued by Saturday morning, the National Weather Service said, after a mix of snow and freezing rain fell in cities including Jackson, Miss.; Birmingham, Ala.; and Atlanta.

On Saturday morning, areas in the Mid-Atlantic, parts of Virginia and southeastern Pennsylvania had received up to two inches of snow, according to the National Weather Service. Parts of Ohio and western Pennsylvania received up to five inches.Areas across the South, including southeastern Oklahoma and west-central Arkansas, will “have temperatures that are going to be in the 20s Sunday morning,” said Bob Oravec, a forecaster at the service.

“A lot of melting is going to go on during the day, and then, as you might expect, freezing again at night,” he said.

The widespread mix of wintry precipitation led to the cancellation of more than 3,000 flights in and out of airports in Atlanta, Dallas, Nashville and Charlotte, N.C., on Friday. That number had decreased to several hundred by Saturday morning.

A ground stop was issued for Boston’s Logan Airport on Saturday morning, according to the Federal Aviation Administration, and multiple airports, including Dallas Fort Worth International and Cleveland Hopkins International, were undergoing de-icing procedures.

At Atlanta’s Hartsfield-Jackson International Airport, where nearly 60 percent of outgoing flights had been canceled or delayed, a ground stop was issued for all incoming Delta flights on Friday after an aborted takeoff led to passengers on a Delta plane being evacuated onto the snowy runway, according to the F.A.A.

A Delta spokeswoman said that four people were treated for minor injuries and that there was “no indication of weather being the cause of the engine issue.”On Saturday morning, more than 300 flights in and out of the airport were canceled. On social media, the airport asked passengers to be prepared for possible delays.

The icy, snowy mix made streets and highways treacherous across a wide swath of the South.

A section of Interstate 22 in Mississippi and Alabama was shut because of a crash in Marshall County, in north-central Mississippi. In northern Alabama, many roads were ice covered and impassable, Jim Stefkovich, a meteorologist with the state’s Emergency Management Agency, said in a statement.

“If you’re trying to get on the roads, don’t get on them,” Gov. Brian P. Kemp of Georgia said at a news conference on Friday, warning that, with temperatures remaining near the freezing mark, the mix of snow and icy rain would likely make roads hazardous through Sunday.

In Atlanta, most shops and restaurants were shuttered. The city seemed to have learned its lesson after less than three inches of snow led to chaos in 2014, leaving motorists stranded, children stuck in buses and schools and government leaders scrambling to clean up the mess.

The city and state seemed better prepared this time. Officials urged people to stay indoors, and highways and city streets were salted before the storm. The roads were virtually empty on Friday — save the occasional skier or sledder — as the morning’s powder melted into slush around noon.One exception to the closures was Waffle House. Benji Waugh, a customer, knew the famously resilient breakfast joint would be open for business.

“Living in the South, anytime there’s a hurricane or a tornado or some kind of storm, everywhere shuts down,” he said in an interview at the Waffle House across from Centennial Olympic Park in downtown Atlanta. “But it’s just easy to go to Waffle House, because they’re always open.”

Governor Kemp declared a state of emergency on Thursday in anticipation of the storm, as did his counterparts in Tennessee and Arkansas. More than seven inches of snow was reported on Saturday morning at Memphis International Airport, according to the Weather Service.