* WHAT...Damaging icing expected. Additional sleet accumulations up to one inch and ice accumulations between three tenths and one inch. Winds gusting as high as 45 mph. * WHERE...The mountains of northeast Georgia, upstate South Carolina, and portions of southwest North Carolina. * WHEN...Until 1 PM EST Monday. * IMPACTS...Significant ice accumulation on power lines and tree limbs may cause widespread and long-lasting power outages. Ice covered roadways will become treacherous and impassable. The hazardous conditions could impact the Monday morning commute. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Ice accumulations will rapidly increase Sunday morning, possibly tapering off by Sunday evening. Treacherous road conditions and power outages will remain Sunday night and likely linger through at least Monday.