A man walks past a shop during a winter snowstorm Tuesday, Jan. 21, 2014, in Philadelphia. A storm is sweeping across the Mid-Atlantic and New England. A swirling storm with the potential for more than a foot of snow clobbered the mid-Atlantic and the urban Northeast on Tuesday, grounding thousands of flights, closing government offices in the nation's capital and making a mess of the evening commute.  (AP Photo/Matt Rourke)