Atlanta, Georgia (CNN) -- Some southern states were getting a second round of unseasonal snow Tuesday, prompting airlines to cancel flights and schools to close for the day.
Parts of several southern states remained under a winter storm warning Tuesday, as a developing low-pressure system threatened to spread snow and rain across portions of Alabama, Georgia, Tennessee, Kentucky and the Carolinas, the National Weather Service said.
Snow fell north and west of metro Atlanta, Georgia, although the city, with a temperature hovering just above freezing, saw mostly rain.
The weather prompted schools in several northern Georgia counties to close, according to CNN affiliates.
Airlines also canceled flights. AirTran Airways has canceled 69 flights in and out of Atlanta, and is expected to cancel more this afternoon, spokesman Christopher White said.
"Should the [weather] event continue into the evening, there is a possibility of many more cancellations," he said. He said the airline is offering free rebooking and changes for anyone traveling to or from Atlanta.
Delta Airlines said it has made about 250 cancellations for flights leaving Atlanta. "Depending on the severity of the storm some additional thinning may be necessary," spokesman Anthony Black said.
The airline is offering to reschedule Tuesday travel plans for those concerned about the weather, at no fee. Customers will have to pay any increase in fares, according to the Web site.
The National Weather Service said snow will continue Tuesday afternoon across northeast Georgia and the western half of upstate South Carolina, although it will taper off later.
Total snowfall accumulations of 2 to 4 inches are expected, mainly in areas along and north of I-85.
The same amount of snow is expected from Shelby, North Carolina to Gaffney and Union in South Carolina, the National Weather Service said.
Snow is also possible in Tennessee, Kentucky and northern Alabama, it said.
CNN's Carolina Sanchez contributed to this report.