[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2010/US/weather/01/07/winter.weather/t1larg.florida.freeze.irpt.jpg caption="Icicles hang from plants on a Florida farm being irrigated to protect the crop from freeze damage." width=416 height=234]
A snowstorm backed by bone-chilling cold flowed into the Deep South on Thursday, reinforcing record low temperatures well into Florida.
The National Weather Service is keeping an eye on a dangerous mix of ice and snow expected across the Southeast, from Louisiana into Georgia.
Atlanta-based Delta Air Lines, noting "winter weather may impact operations in the Southeast," said it would issue winter weather travel waivers to passengers booked on Delta and Northwest flights to, from or through five states.
Travelers have the option of changing their schedule without fees until Saturday if their routes include Alabama, Arkansas, Georgia, Mississippi or Tennessee.
The arctic blast that began last weekend has been blamed for at least seven deaths.
Snowfall amounts of 4 to 8 inches were forecast Thursday for the upper Plains to the Northeast, and as far south as Kentucky and Tennessee. Chicago, Illinois, could see up to 10 inches of snow, according to forecasters.
CNN meteorologist Rob Marciano, reporting from Memphis, Tennessee, said temperatures there have been the coldest in more than a decade.
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