A sprawling storm that blanketed some parts of the Northeast with up to seven inches of snow and deluged parts of the South with heavy rain and deadly flooding is next expected to deliver powerful, damaging winds that will last into Monday.

Power outages, downed trees and hazardous road conditions could disrupt daily life and upend travel plans.

At Kennedy Airport in New York, the winds, which were gusting as high as 45 miles per hour, were expected to delay up to 200 flights on Sunday afternoon, according to the Federal Aviation Administration.

Bob Oravec, a meteorologist with the Weather Prediction Center, called the system a “high-impact storm” and said that the most severe weather on Sunday was likely to occur in the Northeast.

Powerful winds are expected to develop on Sunday afternoon and linger into Monday up and down the East Coast, and westward into the Appalachians and the Ohio Valley.

Damaging winds up to 70 m.p.h. are expected. In the Allegheny Mountains, which straddle Virginia and West Virginia and extend into Maryland and Pennsylvania, a blizzard warning is in effect from 1 p.m. Sunday until 3 p.m. Monday.

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