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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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Cyclone Esther expected to form in Gulf overnight near NT-Queensland border

17:54 EDT

The Bureau of Meteorology (BOM) says Tropical Cyclone Esther is expected to form overnight and pass close to the tiny Northern Territory community of Robinson River on Monday.

Flooding rain spreads west across southern and central Queensland inland

16:47 EDT

More heavy rain is possible across Queensland's southern and central inland areas today in the wake of severe storms leading to flash flooding overnight.

Twin tropical cyclones odds on for northern Australia

15:17 EDT

Two active tropical cyclones are a high chance over northern Australian waters on Monday.