A major winter storm sweeping much of the U.S. was producing heavy snow and ice as it threatened areas from the Central Plains through Mid-Atlantic — leaving tens of millions under weather alerts Sunday.

Millions in the path of Winter Storm Blair are confronting heavy wind, snow and freezing rain.

Millions of Americans can expect winter weather this weekend as a storm brings ice, snow and rain across the central Plains, Ohio Valley and the Mid-Atlantic. The winter weather commences in the Plains late Saturday before reaching the Mid-Atlantic by Sunday,