During this event the sub polar Jetstream in the southern hemisphere was quite wavy and meandering in the first week of summer . December 2013.
The sub -polar jet had been noticeably ‘absent’ during Autumn/ winter of 2013
The water vapour satellite picture from weatherzone shows a closed low rotation of water vapour
ACCESS G windstreams at 500 hPa indicate a strong bend and mid layer trough over VIC and NSW
The strength of the 500 hPa kink is unusual in that it appears there is a Jetstream ! at the 500 hPa layer which l have not seen before.. This jet sits under the 200hPa jet and so has depth
The 200hpa jet stream confirms a strong meandering sub polar jet converging with a strong sub polar jet
A cold pool of atmosphere is held within the mid layer troughing with thickness values 540 and under