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Posted by: crikey Offline Posted: Thursday, 19 September 2019 6:38:10 PM(UTC)
A positive IOD is known to be correlated with a reduction in Australian rainfall

However l have noted over the years that there are 2 parameters that can overcome the lower rainfall

One. A meridonal jetstream pattern both polar and sub polar can direct moisture down to mid latitudes regardless of the IOD phase.

Two.. A tropical dip in isobars which can draw moist N easterlies in from the coral and the sub tropical trough gives the convection.

There is an example of this in ACC g this week

T+ 150hrs forecast

25th September 2019

tropical dip in isobars for QLD sept 25 2019
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