WINTER WINTER ADVISORY HAS BEEN UPGRADED TO A WINTER STORM WARNING NOW IN EFFECT UNTIL 9 AM CST WEDNESDAY... * WHAT...Significant icing. Additional ice accumulations of near one quarter of an inch. * WHERE...Sevier, Howard, Hempstead and Nevada Counties. * WHEN...Until 9 AM CST Wednesday. * IMPACTS...Bridges and overpasses could become slick resulting in travel impacts this morning. Those impacts will continue through the day and especially into the overnight hours. Power outages and tree damage are likely due to the ice. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.