About 900 of Sydney’s northern beaches residents are still without power after the damaging weekend storm blacked out more than 30,000 properties. Ausgrid crews have been working around the clock to restore the power after trees and other debris hit powerlines during Sunday’s brief tornado-like storm. The storm, which particularly impacted beachside areas from Narrabeen to Dee Why, claimed the life of 68-year-old yoga instructor Susan Cobham, ripped roofs off apartment buildings and blacked out 35,000 homes. There are now fewer than 900 customers without power and it is hoped power will be restored to the majority of them on Wednesday. “It’s been a big effort and particularly overnight,” Ausgrid’s Emma Shanks told Sydney radio 2GB. “Just over 34,000 people have the lights back on,” she said. The storm caused extensive damage to the northern beaches power network, with multiple downed powerlines as well as damage to a substation. “We …