Forecasters say they expect two to three inches of snow to accumulate in parts of Alabama, with some isolated amounts of up to four inches.
Much of the state -- including large parts of northern and central Alabama --- was under a winter storm warning Thursday morning.
National Weather Service officials said periods of heavy snow will be likely, with the heaviest snow falling Thursday morning.
Rivers are rising and flooding continues to be a threat as rain keeps falling in Alabama.
A flood warning is in effect for most of northern and western Alabama, and a flood watch covers the rest of the region.
The National Weather Service says as much as 1 inch of additional rain could fall Wednesday, increasing flooding problems since the ground already is saturated with water.
School systems across northwest Alabama are opening late because of the threat of icy weather and flooding.
Schools in Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale, Lawrence, Limestone, Marion and Morgan counties delayed opening for at least two hours Tuesday as a safety precaution.
City school systems in Florence, Muscle Shoals, Sheffield, Tuscumbia and Winfield were among those delaying opening.
The mix of heavy rains and colder temperatures is causing potential weather problems across Alabama.
The National Weather Service says persistent rains already have caused flash flooding in areas, and it has issued flood warnings for the Tennessee Valley region and west Alabama.
Some parts of north Alabama received up to 3 inches of rain quickly, and forecasters say additional rains will only increase runoff and cause more flooding.
There's a flood watch out for much of central Alabama.
Get out an umbrella: Forecasters say the next few days will be soggy across Alabama.
The National Weather Service says parts of the state could see as much as 5 inches of rain between Friday and early next week, and some areas could receive even more rain in small downpours.
While forecasters aren't predicting severe weather, they say brief periods of heavy rain and strong, gusty winds are both possible. So are rising streams and rivers that could lead to flooding.