Roads have been turned to rivers as floods hit Newcastle and heavy rainfall wreaks havoc across eastern NSW.
A flash flooding alert has been sent out in Wallsend in Newcastle's west while residents prepare for a potential evacuation.
The SES has called for reinforcements and firefighters have joined the effort to reach those affected by the weather in the city and on the mid-north coast.
Firefighters have pulled motorists and residents from rising waters on Tuesday night, while authorities plead with the public to avoid driving across flooded roads.
NSW Police fined a man on the far south coast after he attempted to drive across a flooded bridge on Monday.
The 45-year-old became trapped at Murrah and was issued a $425 fine and an infringement notice for negligent driving.
The number of flood rescues has climbed to 11 across NSW, including the rescue of a heavily pregnant woman in the state's south.
A Westpac Life Saver Helicopter airlifted the woman, who is due to give birth soon, from an isolated property and took her to Bega Hospital.
Campers have been warned to stay in contact with the SES, who rescued two people from the Violet Hill Campground in Bulahdelah on the mid-north coast.
Another group on the state's south coast remains stranded, but have enough food to last a few days, Westpac Life Saver CEO Stephen Leahy told AAP.
"We attempted to fly up there on several occasions, however the rain and thick cloud prevented us from getting to that site," he said.
The SES has been called to more than 1000 jobs, mostly in the Sydney metro area.
Sydney's northwest has received up to 97mm of rain since 9am on Tuesday, while the northern beaches has also notched about 87mm, according to the BOM.
A retaining wall collapsed onto a footpath at Bronte while most other calls were for minor flooding or storm damage.
Parramatta Weir has overflowed, cutting ferry services from the area for most of Tuesday.
But there won't be relief any time soon.
BOM meteorologist Dmitriy Danchuk said there was more rain to come, with the heaviest rainfall expected to affect the coast between Taree and Newcastle.
A severe weather warning for heavy rainfall remains in place for the mid-north coast and Hunter region, while a severe thunderstorm warning has been issued for the northern tablelands and north west slopes.
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