Bureau of Meteorologist (BOM) climatologists say the newly official negative Indian Ocean Dipole (IOD) has developed into a much stronger pattern. The Bureau says the negative IOD event, consistent with wetter than average conditions in parts of Australia, is currently at its strongest weekly values in the past 15 years.
Senior principal research scientist with the BOM Harry Hendon told the crowd at last week’s Birchip Cropping Group (BCG) expo that current BOM models suggested the negative IOD pattern will persist and develop through the southern winter and spring.
He said the negative IOD coupled with the chance of a moderate La Niña event developing later in the season, was a key driver in the BOM seasonal outlook for a wetter than average July and August across virtually all sub-tropical Australia.
Dr Hendon said BOM forecasting tools were forecasting a weak La Niña to develop through late winter and early spring.
However, he said if it did develop, the La Niña would be far weaker than the last event in 2010-11 when there was widespread flooding throughout eastern Australia, which was one of the strongest La Niña events on record.
Dr Hendon said with the coupling of the two climatic events, there was the potential for good spring rainfall.
He said the events were unlikely to trigger the flooding rain of 2010-11.
“Farmers can hope for good spring rainfall with a reasonable amount of confidence, but not as extreme as we witnessed in 2010.”
Source: goodfruitandvegetables.com.au
