Sydney braces for heavy rain as parts of the Illawarra exceed July averages in a day

Sydney braces for severe weather and possible flooding as parts of the Illawarra region feel the brunt of the heavy rainfall.

In an updated warning, the Bureau of Meteorology (BOM) said rainfall that could lead to flash flooding was forecast from Saturday for the Sydney Metropolitan area, the Illawarra parts of the Hunter and Central Tablelands.

Sunday could see more of the same with possible “six-hourly rainfall totals between 70 to 120mm”.

However, while Sydney is expected to be hit later this afternoon, Kiama on the state’s south coast has already received 138mm of rain in the past 22 hours — exceeding its July average of 92.3mm.

More than 150mm has fallen on Wollongong, 174mm at Ulladulla and 205mm at Broughton Creek, just south of Kiama, during the same period.

The increased rain in terrain heavy with moisture adds to the potential for landslides, the BOM has also been warned.

The State Emergency Service (SES) has rescued two people from rising floodwaters in the Illawarra region, one at Foxground and another at Albion Park.

sand bags outside a house front door
The SES has conducted two rescues but says most of the calls for assistance are about sand bagging.(Supplied: NSW SES)

SES superintendent Tom Jory said the drivers were caught by flash flooding.

“We’ve seen one where a person has attempted to cross a flooded road,” Mr Jory said.

“And we have seen another one where a couple of people have identified that they have become isolated as a low-level crossing has seen a rise of water over the top of it.

“They made the right call, the safe call, and they have called for help before they tried to make their own way across.”

In the past 24 hours, 233 jobs have been logged with the SES across the state, most for help with sand bagging and leaking roofs.

Catchments from the Hunter to the South Coast are on flood watch.

The BOM says minor to moderate flooding could occur in the Hunter, Central Coast, Greater Sydney and South Coast.

While the Hawkesbury-Nepean Valley could experience major flooding.

Some of the areas of concern include: Gosford, Sydney, Penrith, Parramatta, Wollongong, Nowra, Bowral, Campbelltown, Katoomba, Huskisson, Springwood and Bilpin.

The severe weather is expected to last until Monday as a result of an east coast low forming within the trough on Sunday.

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