Shopping centers throughout the Washington area on Monday saw a glut of postponed “Super Saturday” customers, causing long lines and road bottlenecks as shoppers scrambled to make up for a weekend of lost gift buying.

Retailers and experts were not sure, however, if the last days before Christmas could make up for the loss of what is typically the biggest shopping day of the year, after a record snowstorm this weekend shut down roads and transit and prompted widespread store closures.