Three warehouses collapse, roads turn to rivers as second Sydney storm causes chaos

Three warehouses collapse, roads turn to rivers as second Sydney storm causes chaos

Large hailstones have pummelled Sydney, bringing down five large factories, sparking a fire in the city's west and causing flash flooding.

Superintendent Paul Johnstone of NSW Fire & Rescue told AAP that the buildings in Huntingwood had been brought down under the weight of the hail.

Twenty fire trucks were at the scene about 5.30pm to bring a blaze under control, which had caught light in the collapse.

It's not believed that anyone was injured in the building collapse or subsequent fire, which is understood to be the result of a gas leak

After an Anzac Day on which thousands of commemorators lined Sydney streets under blue skies, social media sites have lit up as Sydneysiders return home to gardens blanketed by large hailstones and sleet.

Hailstones up to two centimetres in diameter have been reported in Blackheath, in the Blue Mountains, and streets have turned white in Sydney's east and the north shore.

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The Bureau of Meteorology has issued a severe weather warning for thunderstorms affecting a long stretch of the NSW east coast.

"Large hailstones, heavy rainfall that may lead to flash flooding and damaging winds are likely," the BoM said.

The warning zone on Saturday evening took in Maitland and Cessnock, greater Newcastle and Central Coast around Gosford and Wyong - areas that were among the worst affected by the deadly storms that lashed NSW this week, leaving hundreds of people cut off by floodwaters.

The bad weather halted play for half an hour at the Allianz Stadium clash between the Sydney Roosters and St George Illawarra, and plunged parts of Sydney's transport network into chaos on Saturday afternoon.


"Sydney motorists are advised to exercise caution while driving due to the heavy rain and hail," a Transport Management Centre spokesman said.

"The flash flooding has affected a number of roads in the metropolitan area making driving difficult."

The State Emergency Service (SES) has advised people to move their cars under cover or away from trees, to secure loose items around the home, keep clear of fallen power lines, creeks and storm drains and not to walk, ride a bike or drive through flood water.

Storms are also forecast to affect Dooralong, Doyalson and Warnervale by 5.45 pm and Budgewoi, Toukley and Gorokan by 6.15pm with 52mm of rain reported in the last hour at Prospect Resevoir.

The Great Western Highway remains closed at Rudders Lane in Eastern Creek due to the building collapse.

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People have taken to social media to post pictures of the unusual weather, which comes only days after New South Wales was hit by its worst storm in a decade.

Channel Seven and The Daily Telegraph last week launched their storm appeal to support those struck by the severe weather.

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An earlier warning for the Central West Slopes and Plains has been cancelled.

The State Emergency Service has advised people to prepare ahead of the storm.