The wild weather has sparked a second consecutive day of travel chaos at Sydney Airport and across the city.
Dozens of domestic and international flights have already been impacted with more cancellations and delays expected.
At least 87 flights have so far been cancelled on Wednesday, according to FlightRadar.
The airport is operating under a Level 4 ‘significant’ delay status.
‘Sydney Airport is working closely with airlines and Airservices Australia to manage the impact of these challenging conditions and we thank everyone for their patience and understanding,’ a spokesperson said.
Sydneysiders have been urged to avoid non-essential travel due to the severe weather that smashed the city overnight.
‘Please try to avoid non essential travel across the rail network today after ongoing severe weather disrupted services and caused damage to infrastructure,’ a Sydney Trains alert states.
‘If you must travel, please allow plenty of extra travel (time) to get to your destination.
Almost 100 flights have already been cancelled due to the wild weather in Sydney
Visibility was low at Sydney Airport on Wednesday morning
‘Be prepared for disruptions, including possible road closures and public transport delays.’
Trains are not running between Penrith and St Marys on the T1 Western line due to a tree blocking the track at Kingswood.
A very limited number of replacement buses are running between Penrith and St Marys.
It’s not known when the track will be reopened.
Commuters are urged to use local bus services to get to St Marys train station.
Trains are also not running between Wyong and Fassifern on the Central Coast line due to overhead wiring repairs at Dora Creek.
Limited buses are operating. A shuttle train service is operating between Fassifern to Newcastle Interchange in both directions.
There are no train services between Penrith and St Marys after a tree fell onto the tracks
Sydneysiders (pictured on Tuesday) are urged to avoid non-essential travel
On the northern beaches, Manly services to Circular Quay have resumed after they were cancelled due to heavy swells.
Check information displays for service updates & allow plenty of extra travel time.
‘We’ve seen some really significant damage,’ Sydney Trains chief executive Matt Longland told ABC Radio Sydney.