The South Coast has been included in a severe weather warning by the Bureau of Meteorology for damaging winds, heavy rainfall, abnormally high tides and damaging surf.
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The BOM says a strong high pressure system over the southern Tasman Sea continues to drive widespread and persistent rain onto the NSW Coast, with the already ravaged Northern Rivers, Mid North Coast and Hunter also included in the warning, along with the Illawarra.
The strong high pressure system will continue to pound the coast, while a deepening low pressure trough in the state's west will bring rain areas to the northern inland.
On Tuesday, as the trough reaches the Tasman Sea, a low pressure system may form, bringing increased rainfall, strong winds, damaging surf and abnormally high tides to the east and south.
Damaging winds, heavy rainfall, abnormally high tides and damaging surf has been forecast for the Illawarra and South Coast.
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Very heavy surf, which may lead to localised damage and coastal erosion is likely for areas of the coastline south of Moruya from Tuesday afternoon, as strong northeasterly winds build over the waters.
Beach conditions in these areas could be dangerous and people should stay well away from the surf and surf exposed areas.
Abnormally high tides which may cause sea water flooding of low lying areas south of Moruya are also possible.
Water levels could exceed the highest tide of the year during Tuesday morning's high tide as a storm surge moves into coastal areas.
Roads in some areas are cut off by water, and there is an increased risk of landslips during this period. In addition, super-saturated soils along areas of the east bring an increased risk of moderately gusty winds toppling trees.
River catchments in this area are wet, bringing an enhanced risk of renewed flooding.
Heavy rainfall will then extend to areas of the South Coast with an enhanced risk with any thunderstorm activity.
Widespread rainfall may lead to river flooding with locations including Wollongong, Nowra and Batemans might be affected.
Most areas of NSW will see a clearing trend early Wednesday as a drier airmass moves into the region.
The State Emergency Service advises that people to move vehicles under cover or away from trees; secure or put away loose items around your house, yard and balcony; keep at least eight metres away from fallen power lines or objects that may be energised, such as fences and trees that have been damaged by fire are likely to be more unstable and more likely to fall.
You can report fallen power lines to either Ausgrid (131 388), Endeavour Energy (131 003), Essential Energy (132 080) or Evoenergy (131 093) as shown on your power bill.
Don't drive, ride or walk through flood water; keep clear of creeks and storm drains.
If you are trapped by flash flooding, seek refuge in the highest available place and ring Triple 0 if you need rescue.
Be aware that run-off from rainfall in fire affected areas may behave differently and be more rapid. It may also contain debris such as ash, soil, trees and rocks.
After bushfires, heavy rain and the loss of foliage can make the ground soft and heavy, leading to a greater chance of landslides.
Stay vigilant and monitor conditions. Note that the landscape may have changed following bushfires.
For emergency help in floods and storms, ring your local SES Unit on 132 500.