Note: All times in this article are in AEDT.
2:00 PM: NEW SOUTH WALES police are encouraging Sydney workers to leave early today to avoid possible traffic and transport delays as more storms are forecast .
Meanwhile the clean up has begun in the city after a tornado tore through the southern beaches with 213 kph winds.
That storm cell has now moved off shore and is heading north out to sea.
Phil Campbell from the NSW SES told ABC 702 that some areas of Kurnell have suffered significant damage.
"We're seeing homes that are completely unroofed, others with very significant structural damage," he said.
"There's a lot of insulation and other debris scattered right across parts of the peninsula.
"We've got many, many powerlines down. In fact, the entire peninsula at the present time is without power. One lady said she had nothing left. She was just sitting there resolutely in a blanket saying her house had been completely destroyed. There could be up to 25 homes with significant damage."
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10:40AM : The freak storm cell affected Sydney City has now moved off shore and is heading out to sea.
There remains two other storms -- one affecting Wollongong and another heading north towards Katoomba in the Blue Mountain -- considered "severe" by the Bureau of Meteorology.
Those storms are expected to produce destructive winds, hailstones, heavy rainfall and potentially flash flooding.
For continued updates on the storms, head to the Bureau of Meteorology website.
SYDNEYSIDERS are being warned to brace for a freak storm including tornadoes, large hailstone, heavy rainfall and destructive winds.
At 11.05am AEDT, the Bureau of Meteorology detected "very dangerous thunderstorms" near Sydney Airport and off the coast of Bondi Beach.
Dangerous situation unfolding with storms heading north towards Sydney. Warning now includes tornadoes. Take care. pic.twitter.com/fHFGb4XrOZ— BOM New South Wales (@BOM_NSW) December 15, 2015
These are heading north, and could strike Sydney City and the Sydney Harbour Bridge by 11.35am.
The BOM radar suggested a possible tornado near Kurnell, at 11am the most likely area for tornadoes is just off Bondi Beach though further tornadoes over land cannot be rules out.
The Bureau also recorded wind gusts greater than 200 km/h at Kurnell 10.30am.
Wind gusts of 142 km/h at Molineaux Point (Botany Bay), and 111 km/h at Little Bay.
The State Emergency Service advises that people should:
- Move your car under cover or away from trees.
- Secure or put away loose items around your house, yard and balcony.
- Keep clear of fallen power lines.
- Keep clear of creeks and storm drains.
- Don't walk, ride your bike or drive through flood water.
- If you are trapped by flash flooding, seek refuge in the highest available place and ring 000 if you need rescue.
- Unplug computers and appliances.
- Avoid using the phone during the storm.
- Stay indoors away from windows, and keep children and pets indoors as well.
- For emergency help in floods and storms, ring the SES (NSW and ACT) on 132 500.