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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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Freezing nights to come for Canberra

15:06 EST

Night-time temperatures will drop well below average in the Capital from Wednesday.

Warm oceans fuelling late end to big wet season

14:26 EST

Warmer-than-normal oceans have contributed to a late end to a big wet season across the southern hemisphere.

Great Barrier Reef: Making clouds brighter could help to curb coral bleaching, scientists say

14:21 EST

Marine scientists have upped the ante in their fight to save the Great Barrier Reef from the devastating effects of coral bleaching.