Lightning strikes over One World Trade Center, center right, during a thunderstorm seen from The Heights neighborhood of Jersey City, N.J., Sunday, June 2, 2013.
PORTLAND, Maine -- The remnants of a violent storm that claimed 13 lives in Oklahoma sent punishing winds and torrential downpours to northern New England and a tornado to South Carolina. And there could be more coming, though meteorologists say the worst is over.
The National Weather Service said the work week could begin with storms bringing showers to the Northeast and mid-Atlantic and large hail and high winds to the Great Plains.
But it won't be like Sunday, when storms flattened trees and utility poles in parts of northern New England, delayed flights in New York City and caused a tornado to touch down in South Carolina.
The weather service issued a rare tornado warning as a line of thunderstorms raced through New Hampshire into western Maine. It said a tornado warning was issued as radar indicated a possible tornado moving from Kingfield, Maine, to Bingham, Maine. The tornado was not immediately confirmed.
By early Monday, more than 12,000 customers were still without power in Vermont, New Hampshire and Maine, down from more than 40,000 outages at the peak.
Weather service meteorologist Bill Goodman said a slow-moving cold front across the Northeast and mid-Atlantic could bring more rain on Monday. "We could get repeat showers over the same areas. It's a recipe for flooding," he said.
In northwestern South Carolina, a tornado reportedly knocked a home off its foundation and blew part of the roof off, said Taylor Jones, director of emergency management for Anderson County. Some trees were blown down and there was heavy rain, but no widespread damage. No injuries were reported.
"It was an isolated incident," Jones said.
Flash flooding inundated parts of South Carolina, particularly in Anderson, S.C. Cars were left underwater in some low-lying parking lots and one homeowner reportedly set up sandbags around his home as the waters began to rose.
The stormy weather in the New York City region shortened the Boston Red Sox-New York Yankees game to 5 1/2 innings and produced backups at major airports. But by early Monday, delays were down to 15 minutes or less at airports on the East Coast.
Patrick Herb, 34, was traveling from Washington Dulles International Airport with his 1- and 3-year-olds to his home in Wisconsin, and had his departure time for a connecting flight in Detroit moved back three times. He described the mood at Dulles as "frustration and fatigue."
In other parts of the South, thunderstorms, high winds and hail rolled through as part of a slow-moving cold front.