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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

Thunderstorm asthma advice issued as storms loom in Victoria

21:33 EDT

Victorians who experience breathing difficulties or asthma have been advised to take extra care this evening, with a cool change and thunderstorms predicted for the state.

Queensland storms: Lockyer Valley, Ipswich clean up after night of destruction

19:24 EDT

Two homes in south-east Queensland were destroyed by fire during yesterday's super cell storms, which also overturned caravans and saw a teenager struck by lightning.

Stormy start to summer for southeast QLD

17:25 EDT

Saturday's storms produced large hail, intense rainfall and destructive winds to several locations across southeast Queensland as two large storms rolled over in quick succession.