Sydney travel chaos as 48 flights are delayed due to thick fog amid warnings of dangerous road conditions

Thick fog has blanketed Sydney causing flight delays at the airport and poor visibility on roads, with drivers urged to take extreme care.

The Bureau of Meteorology issued an alert about the dangerous road conditions on Saturday morning with the fog affecting all Sydney suburbs.

The fog is expected to take a while to lift because of the cold weather and a layer of cloud hanging above it, BOM duty forecaster Helen Reid told AAP on Saturday.

The fog is expected to take a while to lift because of the cold weather and a layer of cloud hanging above it

The fog is expected to take a while to lift because of the cold weather and a layer of cloud hanging above it

Thick fog has blanketed Sydney causing flight delays at the airport and poor visibility on roads, with drivers urged to take extreme care

Thick fog has blanketed Sydney causing flight delays at the airport and poor visibility on roads, with drivers urged to take extreme care

'Given we aren't expecting much in way of heating because we're in winter and there's so much moisture around it will take a while to clear,' Ms Reid said.

It should clear up across most of Sydney by mid-morning, she added.

More than 40 domestic flights and at least eight international flights in and out of Sydney have been delayed.

Travellers are urged to check with airlines about their flight status.

Sunday morning isn't expected to be as foggy, but some patches are forecast in Sydney's west.

The Bureau of Meteorology issued an alert about the dangerous road conditions on Saturday morning with the fog affecting all Sydney suburbs

The Bureau of Meteorology issued an alert about the dangerous road conditions on Saturday morning with the fog affecting all Sydney suburbs

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Sydney fog delays flights, blankets roads

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