First, from the west as a trough/low tied to the Southern and Indian Oceans moves through WA and SA and then from the East as a tropical low drifts into the slot from behind New Caledonia this weekend. That spells a lot of surf ahead.
The charts will be looking good as low pressure steams around the corner from New Caledonia and drops into the slot but we won’t see swell from that until the following week.
This is maintaining the ridge of high pressure along most of the East Coast, with a slight and slow easing of pressure gradients expected over the weekend.
A classic Summer blocking pattern is now setting up, with a slow moving high drifting well south of Victoria and a series of troughs interacting with a strong high pressure ridge which has reached Central NSW and is now building into more sub-tropical regions.
A trough brings a S’ly change tomorrow , with another strong high tracking south of the Bight poised to be the main weather feature this week.
TC Cody is the main game in town and the system has now undergone extra-tropical transition and is classified as a storm force sub-tropical low.
Current ASCAT (satellite windspeed) passes show a healthy fetch of E’ly winds flanking a tropical low as drifts south of the area between Fiji and New Caledonia towards the North Island.
Our current synoptic pattern is typical of the season and the La Nina end of the ENSO cycle. High pressure straddles New Zealand and a tropical low now is drifting south from between Fiji and Vanuatu towards the North Island.
By Thurs the wave climate will come under the influence once more of the tropics, with a broad Tradewinds band being accelerated by a tropical low drifting South from area between Fiji and Vanuatu.
A strong high is now slipping in underneath Tasmania and the combination of the decaying ex cyclone, developing high pressure ridge and an interior trough is creating a long, broad fetch E/NE winds extending from New Caledonia down into the Central Tasman Sea.