In New Jersey, a tornado touched down near Stanhope, meteorologists at the National Weather Service confirmed on Wednesday.

The Weather Service was still working to determine the path and speed of the tornado as of Wednesday afternoon. No major injuries were reported, officials said, but the tornado uprooted trees and caused damage at Lenape Valley Regional High School, which was closed on Wednesday as officials assessed the damage and removed debris.

Farther south, a tornado touched down in Morgantown, Pa., a town about 50 miles west of Philadelphia. No serious injuries were reported.

In New York City, which was also under the tornado warning, there were no confirmed sightings of tornadoes. Joe Pollina, a meteorologist at the National Weather Service, said they had no reports of wind damage in the city, suggesting that no tornado touched down there.

But the warning raised fears that the region could experience the kind of destruction that has occurred in the Rocky Mountains and Midwest. In the last week alone, the authorities have linked tornadoes to at least seven deaths and scores of injuries there.