A major winter storm is set to impact the Central and Eastern U.S., bringing a mix of hazardous ice and heavy snow. The storm is expected to intensify starting Friday, driven by a surge of Arctic air that will usher in the coldest temperatures of the season. The Weather Prediction Center has issued warnings about widespread travel disruptions due to significant ice accumulation, which could lead to downed trees and power lines. Areas at greatest risk for significant icing include northern and eastern Texas, the lower-Mississippi Valley, northern Georgia, and parts of the Carolinas.