...Heavy snow from the Great Lakes to the Northeast and from theCascades/Sierra Nevada Mountains to the Central Rockies......There is a Slight Risk of excessive rainfall from the northernMid-Atlantic to Southern New England on Friday and over parts of thePacific Northwest to Northern California on Saturday......There is a Slight Risk of severe thunderstorms over parts of theCentral Gulf Coast, Southeast, and southern Mid-Atlantic...A major winter storm over the Great Lakes/Ohio Valley will mo...