A large but not especially strong (1029 hPa) high pressure cell is west of Tasmania and slowly moving E where it enters the Tasman and becomes very slow moving. That will be the dominant feature of our synoptic set-up for some time, with a classic summer wind signal of SE winds in the sub-tropics, tending NE through temperate NSW.
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Tradewinds will supply workable swells for the sub-tropics medium term with small pulses of S swell this week favouring NSW.
We’ll see the NE flow ramp up on Sun across the MNC, grading lighter the further north you go, as an approaching front and cut-off low really tightens the pressure gradient.
Troughiness next week does offer potential for low pressure development in the Tasman but we’ve got high model variability so confidence is very low in the outcomes.
Another unstable, troughy week ahead with humid, unstable air over the continent creating a series of troughs, one of which forms a slow moving trough of low pressure off the Mid North Coast which interacts with a weak high pressure cell drifting in the Tasman.
No change to the surf outlook over the weekend which remains small and weak but winds will be all over the place as a trough of low pressure hovers about the NSW North Coast.
S groundswell is still on the radar as a slow moving polar low tied to Fridays front skirts the southern edge of the swell window, over the weekend.
Very quiet across the entire spectrum of the East coast swell window at present. Weak high pressure near New Zealand is being shunted away by another weak high cell moving into the Tasman overnight into tomorrow. Troughiness continues with a slow moving trough line semi-stalled across the MNC this week.
A shallow troughy change Mon looks to stall south of the MNC on Mon. If that current outlook holds we’re looking at a working week of N’ly winds and patches of NE windswell.
Some modest frontal activity pushes through late in the week with a developing N’ly flow on Sun set to provide some NE windswell. Looks like more of the same next week with a fluctuating trough remaining semi-stalled along the NSW coast bringing mostly N'ly winds and small, weak swells.