Along an arctic air boundary, a major ice storm develops Friday across the southern Great Plains extending to the Mid-south U.S. and quickly eastward Saturday into the Carolinas. The Interior Southeast is also affected. Ice accretion of 0.5 to 1.0 inches is possible in this stretch which will cause widespread power outages. Heavy snows extend from the southern Great Plains to the Tennessee Valley. Jackpot snows (18-21 inches) are forecast for Virginia. Southeast New England is added to the heavy snow risk.

A major icing event is forecast for parts of north-central Texas, northern Louisiana/southern Arkansas and eastward across northern Mississippi to South Carolina for late this week and weekend. Dallas and Atlanta are in the major icing threat zone.