The remnants of a violent storm that killed 13 in Oklahoma sent punishing winds and downpours to the U.S. East Coast and a tornado to South Carolina, with more on the way, the National Weather Service said Monday. According to the National Weather Service, the week could begin with storms bringing showers to the Northeast and mid-Atlantic and large hail and high winds to the Great Plains. On Sunday, 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 has not been confirmed. By early Monday, roughly 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 Monday. “We could get repeat showers over the same areas," Goodman said. “It's a recipe for flooding."