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Thousands of residents are reeling from thunderstorms that lashed Sydney on Friday evening, leaving 40,000 homes without power.

The supercell storm rolled in at about 6pm as the Bureau of Meteorology (BoM) issued a severe thunderstorm warning for the metropolitan area, Wollongong and the state's southern border. 

Nine people had to be rescued after flash flooding turned roads to waterways, sparking mass traffic chaos.

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Thousands of residents are reeling from thunderstorms that lashed Sydney on Friday evening, leaving 40,000 homes without power

Nine people were rescued from flash flooding as roads were turned to watersways and traffic chaos ensued

The supercell storm rolled in at about 6pm as the Bureau of Meteorology (BoM) issued a severe thunderstorm warning for the metropolitan area, Wollongong and the state's southern border

Sydneysiders were faced with a mass cleanup on Saturday morning (pictured: damage in Parramatta, Sydney's west)

Footage posted online showed the extent of the deluge, with cars filmed stranded at the intersection of James Ruse Drive and Hassall Street in Rosehill, Sydney's west.  

The western suburbs were the worst hit with almost 50 millimetres of rain falling on Guildford within half-an-hour.

Sydney Airport copped 30mm in 15 minutes as wind gusts as high as 40 km/h moved across the city.

About 50mm fell at West Pennant Hills, 40mm was recorded at Peakhurst and 36mm hit Chatswood, Nine News reported. 

Commuters on public transport were also forced to endure delays with train services stuck at a standstill. 

Sydney Trains said lightening strikes affected the ability for services to run on time and many commuters were stranded on trains for a couple of hours.

The western suburbs were the worst hit as almost 50 millimetres of rain fell on Guildford within half-an-hour

Parramatta Westfield experienced flooding following the intense storm on Friday (pictured)

About 50mm fell at West Pennant Hills, 40mm was recorded at Peakhurst and 36mm hit Chatswood

There are still storm-related delays expected for some train lines on Saturday morning as equipment was damaged at Westmead and a tree branch became caught in wiring at Harris Park.

'Four hours on the train and counting. #SydneyTrains #SydneyStorms,' one commuter tweeted on Friday evening.

'I'm not normally one to whinge about losing the only evening I get with my girlfriend because Sydney Trains can't deal with storms, but 'We are waiting for our paperwork to be processed' is not a good update guard,' tweeted another. 

Travellers at Sydney Airport faced delays and cancellations amid the conditions.   

Commuters on public transport were also forced to endure delays with Sydney Trains services stuck in standstill

Many Sydneysiders took to social media to discuss the wrath of the storm (pictured)

'My holiday to Noosa, a short story: went to the airport full of excitement, got on the plane only to wait on the tarmac for longer than the flight takes, going home after 5 hours at the airport. Didn't go to Noosa #sydneystorms,' a traveller wrote on Twitter.

The Bureau warned there is a chance of another thunderstorm hitting Sydney during the early afternoon on Saturday.

Senior Meteorologist Byron Doyle told Daily Mail Australia that steering winds would likely move potential storm cells out of the CBD faster than what occurred on Friday evening.

'The environmental set up is a little different to yesterday,' he explained. 

 '(Yesterday was) warm and humid along the coastal fringe, that warmer air and more moisture, gives more potential to the storms. It allowed the storms to flare up in the basins.'

But a storm on Saturday is unlikely to sick around, due to the gustier conditions. 

'Those upper winds are faster so it means the storm cells aren't going to stay in one place,' he said.

'We are unlikely to see any heavy rainfall like we saw yesterday.'

'There is the potential for them (the storms) to be gustier.'

Mr Doyle said there is currently a 40-50 per cent chance of an early afternoon storm hitting the Sydney CBD.    

Endeavour Energy said that some of the 27,800 western Sydney homes without power would have to wait until Saturday morning for power to be restored.

'Due to the extensive damage and ongoing storm conditions, some customers will be without power overnight,' Endeavour said in a statement. 

One Twitter user shared a before and after of their garden - showing the extent of the intense flash flooding

Commuters on public transport were also forced to endure delays with Sydney Trains services stuck in standstill

Ausgrid, who are also working to restore power on Saturday, said about 15,200 residents in Sydney's east and north were stuck without power

BoM warned there is a chance of a gusty thunderstorm hitting Sydney during the early afternoon on Saturday

They updated customers on Saturday morning: 'Power restored to 23,000 customers overnight after #sydneystorm. Currently 5,700 customers without supply mainly in Parramatta & Hills districts. Crews from across Western Sydney will be working on repairs throughout today.'  

Ausgrid, who are also working to restore power on Saturday, said about 15,200 residents in Sydney's east and north were stuck without power.

'We apologise for any inconvenience today,' Ausgrid wrote on Twitter.

'Never approach fallen wires, always assume they're live, stay at least 8 metres away and report them to us on 131388,' an Ausgrid spokesman said. 

Huge downpours battered Sydney on Friday evening - knocking out power to tens of thousands of homes and stranding commuters

Cars were filmed stranded at the intersection of James Ruse Drive and Hassall Street in Rosehill (right) and in Guildford almost 50mm of rain fell in half-an-hour

The State Emergency Services (SES) received more than 900 calls on Friday amid the battering conditions

The State Emergency Services (SES) received more than 900 calls on Friday amid the battering conditions. 

Visitors at the Novotel Hotel in Parramatta also filmed staff frantically trying to use towels to soak up water cascading down a flight of stairs.

The start of Friday night's AFLW clash between GWS and North Melbourne was delayed because of the thunderstorm hammering Sydney. 

The round-two opener at Drummoyne Oval was set to start at 7.15pm AEDT but the start of proceedings was pushed back because of lightning close to the venue, while a light tower also briefly went out.  

Rob Taggart, duty forecaster at the Bureau of Meteorology, told Daily Mail Australia by 8.30pm the worst of the storm (pictured) had passed Sydney, although thundery conditions could remain until the morning

The start of Friday night's AFLW clash between GWS and North Melbourne was delayed because of the thunderstorm hammering Sydney 

Footage posted online showed the extent of the deluge as the city copped as much as 50 millimeters of rain in half an hour

The BoM warned in the hours before the storm hit Sydneysiders could see short bursts of rain bringing 15 millimetres of rain in one place in just 10 minutes. 

Rob Taggart, duty forecaster at the Bureau of Meteorology, told Daily Mail Australia by 8.30pm the worst of the storm had passed Sydney, although thundery conditions could remain until the morning.

But the BoM issued another warning later in the evening for the western tablelands and Hunter region as the storm moved westwards. 

The NSW State Emergency Service said their crews were on standby for the thunderstorm - urging motorists to move their cars under cover and away from trees.

Meanwhile, the strengthening winds have forced the NSW Rural Fire Service to put the city on a 'very high' alert amid fears the winds and dry conditions could spark a fire.

Meanwhile, the strengthening winds have forced the NSW Rural Fire Service to put the city on a 'very high' alert amid fears the winds and dry conditions could spark a fire

The NSW State Emergency Service said their crews were on standby for the thunderstorm - urging motorists to move their cars under cover and away from trees