* WHAT...Sub-freezing temperatures as low as 30 expected.
* WHERE...In North Carolina, Robeson County. In South Carolina, Darlington, Dillon, Florence, Marion, Marlboro, and Williamsburg Counties.
* WHEN...From 1 AM to 9 AM EST Sunday.
* IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.