Strong, damaging winds knocked over trees and power lines early Friday, leaving many people in the dark and some streets in dangerous conditions.

Pennys Road in Riverhead was among the roads closed on Friday because of fallen utility poles and branches. Crews were seen working to clear the area and reopen the street.

Utility poles were leaning outside the entrance of Longwood High School in Middle Island, causing classes to be canceled. Out of an abundance of caution, the Junior High School down Longwood Road was also closed.