NEW YORK — A nor’easter blustered into New York and New Jersey on Wednesday with rain and wet snow, plunging homes right back into darkness, stopping commuter trains again and inflicting another round of misery on thousands of people still reeling from Superstorm Sandy’s blow more than a week ago.

Under ordinary circumstances, a storm of this sort wouldn’t be a big deal, but large swaths of the landscape were still an open wound, with the electrical system highly fragile and many of Sandy’s victims still mucking out their homes and cars and shivering in the deepening cold.

Exactly as authorities feared, the nor’easter brought down tree limbs and electrical wires, and utilities in New York and New Jersey reported that nearly 60,000 customers who lost power because of Sandy lost it all over again as a result of the nor’easter.

Mark L. Fendrick, of Staten Island, tweeted Wednesday night: “My son had just got his power back 2 days ago now along comes this nor’easter and it’s out again.”

John Miksad, senior vice president of electric operations at Consolidated Edison, the chief utility in New York City, said, “I know everyone’s patience is wearing thin.”

As the nor’easter closed in, thousands of people in low-lying neighborhoods staggered by the superstorm just over a week ago were urged to clear out. Authorities warned that rain and 60 mph gusts in the evening and overnight could topple trees wrenched loose by Sandy and erase some of the hard-won progress made in restoring power to millions of customers.

“I am waiting for the locusts and pestilence next,” New Jersey Gov. Chris Christie said. “We may take a setback in the next 24 hours.”

Ahead of the storm, public works crews in New Jersey built up dunes to protect the stripped and battered coast, and new evacuations were ordered in a number of communities already emptied by Sandy. New shelters opened.

In New York City, police went to low-lying neighborhoods with loudspeakers, urging residents to leave. But Mayor Michael Bloomberg didn’t issue mandatory evacuations, and many people stayed behind, some because they feared looting, others because they figured whatever happens couldn’t be any worse than what they have gone through already.

“We’re petrified,” said James Alexander, a resident of the hard-hit Rockaways section of Queens. “It’s like a sequel to a horror movie.”

Forecasters said the nor’easter would bring moderate coastal flooding, with storm surges of about 3 feet possible Wednesday into Thursday — far less than the 8 to 14 feet Sandy hurled at the region. The storm’s winds were expected to be well below Sandy’s, which gusted to 90 mph.

By evening, the storm had created a slushy mess in the streets in the metropolitan area. Eight-foot waves crashed on the beaches in New Jersey, which was lashed with a wintry mix of rain, sleet and snow.

Sandy killed more than 100 people in 10 states, with most of the victims in New York and New Jersey.