* WHAT...For the Freeze Warning Saturday morning, sub-freezing temperatures as low as 28 to 32 degrees expected, though some locations may remain just above freezing. For the Freeze Warning Sunday morning, sub-freezing temperatures as low as 27 to 32 degrees expected. * WHERE...All of central Alabama. * WHEN...For the first Freeze Warning, from 12 AM to 8 AM CST Saturday. For the second Freeze Warning, from 12 AM to 8 AM CST Sunday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.