Climate in-brief

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This weeks chart shows humidity well above normal down the centre of Australia.

This weeks chart shows humidity well above normal down the centre of Australia.

  • Conditions in the tropics, our major source of moisture, continue to be “disorganised” according to the latest NCEP update this week, as the atmosphere continues to realign with warmer tropical waters;

  • The SAM index is finally weakly positive, assisting the formation of moist air into eastern Australian agricultural areas;

  • 90-day SOI has exceeded La Niña thresholds (+8), and the air pressure at Darwin is now below normal for the first time this season;

  • Multi-week models are favouring rain across southern areas and the ranges in the next 10-days. All other areas look to week 3-4 of October for moisture to arrive;

  • Summer cropping analysis for La Nina years; and

  • What does this years La Nina mean for our climate in 2021? - the latest research.

Australian weekly rainfall and relative landscape water balance

The air pressure at Darwin is finally below normal. Moisture has streamed down the inland over the last week.Rainfall maps courtesy http://www.bom.gov.au/jsp/awap/rain/

The air pressure at Darwin is finally below normal. Moisture has streamed down the inland over the last week.

Rainfall maps courtesy http://www.bom.gov.au/jsp/awap/rain/

The high pressure system in the Tasman Sea keeping eastern Australia dry, but the interior has been in the sweet spot.Australian relative landscape water balance ‘upper soil’ courtesy BOM

The high pressure system in the Tasman Sea keeping eastern Australia dry, but the interior has been in the sweet spot.

Australian relative landscape water balance ‘upper soil’ courtesy BOM