* WHAT...A light freeze or frost is expected as temperatures fall to between 29 and 36 degrees late tonight and early Sunday morning. The coldest readings are expected in rural valleys and other low-lying areas. * WHERE...Portions of east central, northeast, south central, and southeast Kentucky. * WHEN...From midnight tonight to 10 AM EST Sunday. * IMPACTS...Frost and freeze conditions could kill crops and harm other sensitive vegetation. Sensitive outdoor plants may be killed if left uncovered.