Perth was plunged into chaos last night as wild thunderstorms ripped through the city with a ferocity not seen in decades.

Motorists have been warned to take care with more than 80 traffic lights still out of action after last night’s wild storms and more bad weather on the way.

Western Australian Police will be focusing on controlling traffic at major intersections where traffic lights are not working, including parts of Albany Hwy, Reid Hwy, Orrong Rd, Wanneroo Rd, Roe Hwy, Scarborough Beach Rd and Leach Hwy.

A landslide has closed the eastbound lane of Mounts Bay Rd between Winthrop Ave and Mitchell Freeway and people trying to access the Mount Hospital are advised to travel there via Thomas Rd and Kings Park Rd.

The storm that swept Perth yesterday afternoon has caused millions of dollars worth of damage, and more than 90,000 homes are still without power.

Power companies were scrambling to restore power, but said it could be days before some homes had electricity after extensive damage to their networks.