A snowstorm has blown into the mid-Atlantic states, causing dozens of accidents on icy roads, prompting school closures and stoking worries about possible power outages.

As the Midwest and Northeast dig out from back-to-back winter storms, new systems are building and are expected to dump more snow from the middle of the country to the East Coast this week. Plenty of cold air remains is in place to the north,

Another powerful storm system is expected to sweep across a wide swath of the United States, bringing heavy rain to Southern California, heavy snow to parts of the West and Midwest and more snow and freezing rain to the Northeast and New England.