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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IOD reaches new (dry) heights

13:48 AEDT   The strongest positive Indian Ocean Dipole of the last two decades is limiting rainfall in Australia this spring.

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