The Bureau of Meteorology (BoM) has issued a severe weather warning for Sydney and parts of the New South Wales Central Coast, with heavy rainfall and strong winds expected to hit this evening.
The bureau said a low pressure system that was developing off the state's Central Coast was behind the bad weather which is also predicted to bring flash flooding to some areas.
BoM meteorologist Robert Taggart said people living in Sydney's eastern suburbs and northern beaches were likely to be hit the hardest, with rainfall of up to 100 millimetres expected.
"The northern beaches area is the area most likely to receive the higher falls," he said.
"But we can't rule out falls in excess of a 100 millimetres right from Cronulla all the way up to the Central Coast," he said.
Mr Taggart warned motorists driving through these areas to be prepared to encounter flash flooding.
"It could affect traffic during peak hour and after peak hour," he said.
"Particularly where there is heavy rainfall near the coast."
The State Emergency Service has warned people to avoid driving through flood affected areas and to keep clear of creeks and storm drains which could overflow.
Other areas within the Sydney basin, including the city's western suburbs, are expected to get lesser rainfalls of 30 millimetres.
The conditions are expected to ease by Thursday morning as the low pressure system moves further east.
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