A surprisingly robust winter storm blanketed New York City with snow at the start of the long holiday weekend, leaving streets slippery and coated with powder and delaying air travel for the second time in a week.

Residents of Brooklyn and Staten Island woke up Saturday to seven inches of snow, the city’s sanitation department said, far more than the 2 inches (5 centimeters) forecast. By 10 a.m. some neighborhoods had logged more than 10 inches.