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“When you lose a day of sales between now and Dec. 25, you don’t make it up,” Stifel Nicolaus analyst Richard Jaffe told the Associated Press. “If you’re closed for business on Saturday, you’re not going to do twice the business on Sunday.”

Even when major storms don’t materialize, forecasts can keep shoppers home.

“When the radio says, ‘Stay tuned, don’t leave your house, this is the storm of ‘09,’” that’s bad for business, Mr. Jaffe said.

Allison Fischer, a spokeswoman for Tysons Corner Centre, said the mall doesn’t keep figures on the number of visitors, but that Friday the mall was “very busy.” As of mid-afternoon Friday, the mall was scheduled to be open from 9 a.m. to 11 p.m.

“We’re very excited for the weekend,” she said.

Dean Honeycutt, Sean Lengell, Jennifer Haberkorn and S.A. Miller contributed to this report.