A massive downpour over Wollongong's northern suburbs caused roads to flood, trees to fall and closed part of Bulli Pass on Saturday morning.
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According to emergency services workers, Austinmer fire crews helped remove one car from water near the bottom of Bulli Pass just before 11am.
The downpour closed part of the road, with police and fire crews helping to keep other traffic away from the water.
On Lawrence Hargrave Drive, a tree blocked the north bound lane around 11.30am near Scarborough Public School, with fire crews assisting to remove it.
Thirroul's Philip Street turned into a waterfall, with one resident saying it was "worse than I've ever seen it", as gutters overflowed in the heavy rainstorm that hit the area.
Transport for NSW advised that buses were replacing trains between Thirroul and Waterfall on the South Coast Line due to a fallen tree on the tracks at Stanwell Park.
Drivers in Wollongong also reported that roads are quickly becoming dangerously flooded.
Across the region, the SES has warned of heavy rain with slow moving band of showers and thunderstorms over Wollongong, Bulli and Port Kembla and have advised people to stay away from creeks and storm drains.
The SES previously said that severe thunderstorms could bring damaging winds that might uproot trees and short heavy bursts of rain that could lead to flash flooding.
It has advised people who live in low-lying areas or places close to waterways already affected by flooding to monitor the Bureau of Meteorology website.
The bureau has warned that the ground is wetter than usual, due to the months of heavy rain, which means flash flooding can't be ruled out during slow moving thunderstorms.
Thunderstorms are forecast across the region on Saturday, with between 9-25mm of rain predicted, the Bureau of Meteorology says.
Rain is expected to continue for the rest of the week.
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