* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Crawford, Kalkaska, Montmorency, Oscoda, and Otsego Counties. * WHEN...Until 9 AM EDT Thursday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. * ADDITIONAL DETAILS...Coldest temperatures will be in the high valleys and other typically cold locations. The duration of temperatures at or below freezing will likely be between 2 and 4 hours.

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