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Efforts to clear water, remove branches and debris and restore power to battered Sydney homes has begun after massive thunderstorms battered the city overnight.
Very dangerous thunderstorms were detected near Blacktown and Riverstone, the Bureau of Meteorology said on Thursday evening.
The storms moved east with severe thunderstorms hitting the city and eastern suburbs by nightfall.
Images from the city's west showed golf ball-sized hailstones pummelling cars, while almost 20,000 lightning strikes were recorded across the greater Sydney area.
The downpour triggered flash flooding, power outages and more than 350 calls to the rescue service.
Roads, trains and even flights were delayed and diverted away from Sydney's airports.
The wet weather isn't slowing down and could last until early or mid next week.
Friday is forecast to bring showers and thunderstorms to the state's east possibly extending to the northwestern slopes.
Showers are forecast on Saturday extending to northern inland areas while on Sunday showers will likely reach the far northern inland with a chance of thunderstorms in the north.