* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...In Kentucky, Boyd, Carter, Greenup, and Lawrence Counties. In Ohio, Lawrence OH County. In West Virginia, Cabell and Wayne Counties. * WHEN...From midnight tonight to 9 AM EST Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Patchy frost is possible in sheltered valleys and low-lying areas tonight as colder temperatures arrive behind a cold front.