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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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News quiz: Will your strategies be criticised like the Trump-Biden presidential debate or will you race up the charts?

08:22 EST

Will your quiz skills be panned as much as the tactics in the first presidential debate or will you race up the charts like it's an Instagram record? Test yourself and find out.

Kununurra counts 'catastrophic' cost after freak storm slams WA town's airport

23:56 EST

Kununurra aviation operators are assessing the damage after an intense storm flipped planes and damaged buildings in the West Australian town on Wednesday afternoon.