* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Central Chippewa, Eastern Mackinac, Western Chippewa, and Western Mackinac Counties. * WHEN...From 10 PM this evening to 8 AM EDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. Take steps now to protect tender plants from the cold.