Severe thunderstorms to bring giant hail, heavy rain to NSW

NSW is in for another round of giant hail, heavy rain and damaging winds, as low pressure systems that have wreaked havoc across the state all week clear out to sea.

The state has been lashed by wet and windy conditions since last Friday, with Sydney and the Central Coast on Monday copping a downpour that caused flash flooding and a landslide, and Tamworth on Thursday being pelted with tennis ball-sized hail.

Even more miserable weather is on the way, with the Bureau of Meteorology on Friday issuing a warning for severe thunderstorms around Dubbo, Parkes, Griffith and Goulburn.

BOM forecaster David Wilkie told reporters those "super-cells" will bring giant hail, heavy rain and damaging winds to those areas on Friday, and to parts of the mid-north coast and Northern Tablelands on Saturday.

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A severe weather warning has also been issued for the NSW south coast between Wollongong and Narooma, and as far inland as the ACT, with a potential for flooding.

That low causing the weather will head east during Saturday, bringing showers to many areas, according to the Bureau of Meteorology.

"There's going to be fairly significant weather this weekend, (but) the good news is that as we move into next week... we'll start to see a bit of an easing of conditions, which we haven't seen through NSW in probably a week or so," Mr Wilkie said.

The NSW State Emergency Service is warning residents not to drive, walk or ride through floodwater, and to avoid driving at all if the weather becomes extreme.

"Floodwater can wash out roads that once lay underneath and just 15cm of water can start to float a small car," an SES spokesman told AAP.

The SES's warning comes after an Armidale man died in hospital after a falling tree branch crushed his car in the Northern Tablelands on Wednesday.

The SES is also urging residents to get their homes storm-ready, as the NRMA revealed 54 per cent of all home claims it received last financial year related to storm damage.

The insurance company also surveyed 1000 people and found while 85 per cent were stressed about storm danger and damage, only 35 per cent had taken steps to prepare for severe weather.

Sydney's Hills District and Hornsby region were the city's most storm affected areas, while NSW-ACT border town Jerrabomberra was the worst hit in the state, according to NRMA data.

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