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Flights were cancelled and trains suspended as intense rain and flash flooding wreaked havoc in Sydney on Wednesday morning.
The NSW State Emergency Service received almost 260 calls for help by 7am, including 11 flood rescues.
"It's turning into being a wild day," SES regional controller Greg Murphy told Seven Network.
According to Weatherzone, Observatory Hill received its entire November monthly average in "less than two hours".
"Between 5:20am and 7am, the city collected 84.6mm and the November average is 83.8mm," it tweeted.
Drivers have been told to stay off the roads as public transport across the city has been similarly affected.
Social media users have been sharing images and video of the wild weather under the hashtag #SydneyStorm.
A number of flights at Sydney Airport were delayed or cancelled, with the airport reduced to just one runway.
Thousands of properties were left without power, including hundreds of businesses in the CBD.
NSW Police are urging motorists to "take extra care on the roads today with horrendous weather currently lashing Sydney".
"The conditions we are experiencing today are some of the worst I've ever seen, and I am appealing to everyone, motorists and pedestrians alike, to take care," assistant commissioner Michael Corboy said.
"Drivers need to consider reducing their speed to make sure they have enough braking distance for themselves and for the vehicle in front, and to drive to the conditions.
"We can't stress enough that motorists should never attempt to drive through floodwaters or cross flooded causeways."
SES Assistant Commissioner Scott Hanckel even advised people try to arrange to work from home if possible.
He was hopeful the SES would have thousands of volunteers available to call on across the South Coast, Hunter and Sydney metro areas, should people need help with fallen trees or flooding.