* WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 20 possible. * WHERE...A portion of southeast Michigan. * WHEN...For the Frost Advisory, from 2 AM to 10 AM EDT Sunday. For the Freeze Watch, from Sunday evening through Monday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive