Weather Glossary - Other

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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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Dry outlook as La Nina decays

11:37 AEDT The weak La Nina that briefly popped up in the last two months is already breaking down and its decline is being reflected in the rainfall outlook for autumn.

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