Relentless waves wash away 25 metres of sand and threaten to swallow million-dollar mansions in Sydney's northern beaches – as backyards are coated in a thick layer of dirty foam
- Waterfront homes at risk of being washed away on Sydney's northern beaches
- Collaroy and Narrabeen residents woke on Monday to significant beach erosion
- Waves of sea foam within metres of waterfront homes and covered backyards
- Experts have warned further beach erosion is forecast for next weekend
Waterfront mansions are in danger of being washed away as Sydney beachside suburbs are inundated in thick sea foam.
Memories of the June 2016 storm have come flooding back for Collaroy residents on Sydney's northern beaches as the weekend-long wild weather continues to batter the coast.
Residents living along the beach between Collaroy and Narrabeen woke on Monday to significant erosion and a massive build up of sea foam with up to 25 metres of sand washed away.
Photos shows waves of a dirty-coloured sea foam coming within metres of beachfront mansions.
Collaroy on Sydney's northern beaches was covered in thick sea foam on Sunday night
A massive build up of white sea foam came within metres of Collaroy homes on Monday
Further beach erosion damage was expected later on Monday morning.
'Basically, the next few hours will be critical,' University of NSW coastal researcher Mitchell Harley told the Sydney Morning Herald.
'After that, the risks will drop significantly.'
He warned another threat of further beach erosion could emerge next weekend.
'Plenty of sea foam going into backyards, but erosion risk dropping. Impact to houses spared, ready to go again for next weekend's forecast massive waves and already eroded beaches,' Dr Harley later posted on Twitter.
The erosion damage already caused could possibly take months to repair.
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Collaroy locals on Sydney's northern beaches took to social media on Sunday night to post photos of their suburb being surrounded in sea foam
The sea foam was mid-calf deep in one Collaroy street overlooking the beach.
'It's incredible. I am down at the beach all the time but [have never seen] anything like this,' one resident told the Sydney Morning Herald.
Locals took to social media on Sunday night with photos of Collaroy Surf Club surrounded in sea foam.
'It’s a couple of feet thick from the pool to flight deck,' one resident posted on Instagram.
Another added: 'Weird sea foam on the king tide at Collaroy tonight. It was almost as deep as a man and covered the whole foreshore.'
Cars were covered in thick sea foam near Collaroy Beach late Sunday night
Collaroy on Sunday night before streets overlooking the beach were covered in mid-calf deep of sea foam on Monday morning
Experts have warned of further beach forecast for Sydney's northern beaches next weekend
Waves up to six metres high propelled by the gale force winds are threatening to wash away beachside mansions in echoes of the storm that carved 15m off the coastline and wrecked seven Colloroy beachside properties in 2016.
But there are many waves far bigger that could cause significant damage.
'Erosion of the beaches inevitable which could impact properties that are close to the beach,' Weatherzone told Daily Mail Australia on Sunday.
'The swell is huge. There's been 13.9m waves record off Sydney, which is ridiculous.'
Sydney has received a third of its annual rainfall during the last four days as the heaviest rain in 30 years inundated the city.
Aerials views show the significant beach erosion threatening to wash away Collaroy homes
Residents have also captured significant beach erosion in nearby Narrabeen (pictured)
