That trough then deepens o/night Sat into Sun with a building trend in S-S/SE swell under fresh/strong winds from the same direction.
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Into the weekend and we should see an increase in NE-E/NE swell on Sat from winds feeding into a trough near the Gippsland coast.
Sun is a different story as strong, long period S swells from a storm force system in the Southern Ocean make landfall.
Another deep low is expected to bomb under the continent and send more long period groundswell our way late this weekend under a continuing unstable, trough pattern.
The continent is unstable with a heat trough over NWWA and more troughs extending from the interior through to the East Coast. A deep low and powerful frontal system with a long trailing fetch is currently traversing the lower Tasman, generating long period S swells.
No great change to the weekend f/cast. The N’ly fetch reaches peak strength o/night and into Sat morning with a corresponding peak in NE windswell expected.
A weak ridge up the sub-tropics has a lighter E’ly flow with stronger N-NE winds south of the MNC down to the South Coast and Tasmania. We’ll see this pattern persist with increasing NE windswell across NE Tas this week. A strong frontal progression is expected to provide a series of S swells next week.
The high initially weakens with a lighter onshore flow before re-strengthening as it approaches New Zealand and has the pressure gradient tightened on the western flank by the complex trough systems. That will produce a N’ly flow, expected to increase as the week goes on with increasing NE windswell late in the week and early weekend.
Into next week and the main story is a large high moving into the Tasman and becoming slow moving, setting up a summer-style blocking pattern with developing NE winds and NE windswell, becoming solid by the end of the week.
Under current modelling this should be an extended event as the N'ly fetch persists and actually increases later next week.