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540 line

Indicates the 540 decametre line on the 1000-500 thickness chart. Often used as a rough guide to determine when an airmass is cold enough to produce snowfalls on the Australian southern alpine areas.

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Weather News

Was Sydney's smoky morning necessary?

13:24 EST

Smoke from hazard reduction burns caused 'very poor' air quality in Australia's largest capital city during this morning's peak hour commute.

Sydney lost as fog, smoke from hazard reduction burns settles over city

09:34 EST

Sydneysiders could have been forgiven for not knowing where they were this morning after the iconic skyline was shrouded in thick smoke and fog.

Myer Hobart store beats flood and fire, but market conditions may be toughest foe

17:03 EST

It has risen again from the ashes and has emerged from a devastating flood — but the challenge for the latest incarnation of Myer's Hobart store is simply to get people to shop there.