A powerful winter storm is bringing heavy snow, treacherous ice, and dangerously cold temperatures to the Mid-Atlantic region, marking the final act in a series of winter storms that have battered the United States for the past three weeks.

The last in a long train of storms will bring snow and ice to the Mid-Atlantic and Carolinas on Wednesday. While Washington will be near the northern edge of the storm starting late in the morning — with a dusting to a half-inch of snow possible in the District and areas to the south by the evening — impacts will be moderate to major farther south.