ATLANTA, GEORGIA — Flight cancellations piled up and state officials warned of continuing dangerous roads Saturday in the wake of a winter storm that closed schools and disrupted travel across parts of the southern United States. A storm that brought biting cold and wet snow to the South was moving out to sea off the East Coast on Saturday, leaving behind a forecast for snow showers in the Appalachian Mountains and New England. But temperatures are expected to plunge after sundown Saturday in the South, raising the risk that melting snow will freeze and turn roadways slick with ice. “I definitely don’t think everything’s going to completely melt,” said Scott Carroll, a National Weather Service meteorologist in Atlanta, Georgia. “Especially the secondary roads will probably still have some slush on them.” Airport tie-ups remain Major roads were mostly clear, but few ventured out early Saturday. The Atlanta Hawks postponed the pro basketball game they were supposed to host Saturday afternoon against the Houston Rockets, citing icy conditions. Major airports including those in Atlanta and Charlotte, North Carolina, continued to report disruptions Saturday. While flights were operating, airlines canceled and delayed more flights after Friday’s weather slowed airline travel to a crawl. By Saturday afternoon, about 1,000 flights in and out of Hartsfield-Jackson Atlanta International Airport were canceled or delayed, according to tracking software FlightAware. Sarah Waithera Wanyoike, who lives in the Atlanta suburb of Lilburn, was starting her second day at Atlanta’s airport Saturday. Wanyoike arrived at the world’s busiest airport before sunrise Friday to catch an Ethiopian Airlines flight, on the way to her job in Zimbabwe. The plane boarded after a delay Friday, but never left, discharging passengers back to the gate after taxiing around and never taking off for six hours. Wanyoike said her luggage remained stuck on the plane and she dared not try to go home because she was told to be back at the gate before dawn Saturday. “People slept with their babies on the floors last night,” Wanyoike said. Delta Air Lines, the largest carrier at the Atlanta airport, said late Friday that it was “working to recover” on Saturday, saying cancellations would be worst among morning flights because of crews and airplanes that weren’t where they were supposed to be after the airline canceled 1,100 flights Friday. Richmond drops boil-water advisory Meanwhile, the city of Richmond in the state of Virginia, lifted its boil-water advisory late Saturday morning, nearly a week after Monday’s snowstorm cut power and caused a malfunction to the city’s water system. Mayor Danny Avula said lab tests confirmed that Richmond’s water was safe to drink, adding that boil-water advisories had been lifted for some surrounding counties as well. The temporary halting of the water system affected more than 200,000 people, some of whom lacked water in their homes because of diminished pressure. Freezing rain pushed up electricity outages above 110,000 in Georgia on Friday night, but most power was restored Saturday. The National Weather Service reported small amounts of ice accumulation around Atlanta from the freezing rain. Parts of mountainous western North Carolina saw as much as 4.5 inches (about 11 centimeters) of snow in a 24-hour period that ended at 7 a.m. Saturday, according to the National Weather Service. Parts of middle Tennessee saw nearly 6 inches (about 15 centimeters) of snow by Saturday morning. Earlier this week, the storm brought heavy snow and slick roads to much of the states of Texas and Oklahoma before moving east. The states of Arkansas and North Carolina mobilized National Guard troops for tasks such as helping stranded motorists, and governors declared states of emergency. City starts digging out Businesses and churches started digging out from under several inches of snow that fell on Nashville, Tennessee, in order to reopen for the weekend. At Judah Temple of Praise, church members Saturday shoveled, salted and blew snow off sidewalks and the parking lot in advance of Sunday services. “We’re not going to use the excuse of a parking lot covered in snow to not show up and praise our God tomorrow,” said elder Myyah Lockhart. Andy Atkins, co-owner of the Bad Luck Burger Club food truck in east Nashville, brushed off picnic tables with a broom and shoveled snow off the sidewalk in front of his business. He closed the truck Friday but hoped that customers would show up Saturday. “Having a day off is good for the soul, but is bad for the pocket, you know,” said Atkins. Alabama schools could stay closed School was canceled Friday for millions of children from Texas to Georgia and as far east as the state of South Carolina, giving them a rare snow day. Officials in northern Alabama on Saturday said schools could remain closed Monday if ice doesn’t melt off secondary roads. The storm piled up more than a year’s worth of snowfall on some cities. As much as a foot (about 31 centimeters) fell in parts of Arkansas, and there were reports of nearly 10 inches (about 25 centimeters) in Little Rock, which averages 3.8 inches (9.7 centimeters) a year. More than 7 inches (about 18 centimeters) fell at Memphis International Airport in Tennessee. The city usually sees 2.7 inches (6.9 centimeters) a year. The storm dumped as much as 7 inches (about 18 centimeters) in some spots in central Oklahoma and northern Texas. The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes ventures south into the United States, Europe and Asia. Some experts say such events are happening more frequently, paradoxically, because of a warming world.