The slow moving low in the South Pacific slot has a very broad, almost semi-stationary fetch on its southern flank, buttressed by high pressure over New Zealand. This is likely to see a fully developed sea state with plenty of sizey mid period E swell across most of the eastern seaboard.
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New high pressure moves SE of Tasmania to start next week and compared to Wed’s notes it’s looking stronger and slower moving, which is good news for surf potential, especially medium term as it anchors low pressure drifting down from the tropics into the wide open South Pacific slot.
No great change to the outlook as a tradewind fetch anchored by tropical low pressure near New Caledonia remains active before the low slides off to the SE later tomorrow and into Fri. We’ll see continuing mid-period tradeswells from this source, slowly easing from todays peak.
High pressure support for the tropical systems which is currently anchoring a tradewind fetch in the Coral Sea weakens substantially over the short term, with E swell potential thus weakening. We’ll still see plenty of fun E’ly trade swell in the sub-tropics but the top end potential has taken a haircut as well as the duration of the event.
A more classic looking summer chart to start next week with high pressure in the Tasman and low pressure centres near New Caledonia and in the South Pacific slot, with a healthy E’ly tradewind fetch extending across most of the Central and Southern Coral Seas.
The tropics is in an active state with multiple low centres expected along the monsoon trough as it responds to a phase of the MJO passing into Australian longitudes. Still plenty of uncertainty there, with any meaningful swell subject to extremely low confidence in specifics.
Multiple low pressure systems are suggested on long range model guidance, potentially tropical cyclones which could deliver large E’ly swells.
Either way, it’s looking like our eastern swell window is about to get into the swing of things and finally resume its regular summer programming.
The approaching southerly change should be getting close to the Qld border around dawn..
We’ve got plenty more swell on the way, and much better winds on Tuesday as the synoptic pattern relaxes, allowing a light variable airstream to envelop the coast.