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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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Weather News

Wet week for NSW

17:41 EST

Three rain-bearing systems will traverse New South Wales within the next seven days, rounding out a bumper May.

Dampened SA in for rain but also cold, strong winds

17:40 EST

Rain has fallen across a large part of South Australia during Wednesday and there is more to come, mainly on Friday, coinciding with cold, winds.

Frost snaps into gear across NSW

17:40 EST

This morning left many people wishing they could stay in bed as Jack Frost knocked on the door.