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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

Dry winter exacerbated by frost over growing regions

12:43 EST

Winter has made itself felt in recent days over the southeastern inland but not in the form of rain bearing cold fronts.

Canberra's cold, dry start to winter

14:47 EST

Canberra is known for its cold weather, although this winter has been even colder - and drier - than usual.

Late-week frost covers eastern Australia

13:49 EST

It's a frosty end to the week across much of eastern and southeast Australia, with parts of four states experiencing their lowest temperature in two years this morning.