We're now at the peak of the swell cycle from STC Jasper so it's a slow dowards trend for the rest of the week.
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It’s slow (2-3kts) S/SW track between 158-156E is in the acute N/NE swell window- even though that part of the window tends to be flukey due to interference from reefs and it’s reliance on a perfect track to clear Fraser and the Breaksea Spit. That aids confidence in some steeply angled N/NE-NE groundswell from STC Jasper over the weekend.
TC Jasper has formed in water surrounding the Solomon Islands and is intensifying under favourable conditions. Most models now are suggesting a SW-W curvature as it enters the Coral Sea, with a smaller surf potential compared to Mondays notes as it crosses the coast instead of tracking through the Coral Sea.
Weak high pressure in the Tasman and a trough is creating a “doldrums” type pattern of slack pressure gradients and small swells this week, with a few wind changes to negotiate. No major swells expected this week. The headline feature is a potential major tropical cyclone drifting into the Coral Sea with a poleward (southwards) track late this week, over the weekend and into next week.
Further ahead and some weather model runs are starting to look pretty damn juicy with respect to a developing TC in the South Pacific moving into the Coral Sea later next week. Still very early days but a full blown cyclone swell is now a definite possibility, possibly as early as next weekend and into the week 9/12
In the South Pacific the previously active area near the Solomons that has already spawned two tropical cyclones looks to flare up again next week with convective activity enhanced by a cross-equatorial flow. We may see a new tropical depression or even cyclone form later next week, with uncertain surf potential at this very early stage.
A small trough of low pressure off the sub-tropical coast (SEQLD likely) will see a brief flush of E/NE swell. One bright spot in a very dull forecast.
High pressure is straddling Tasmania with the remnants of a front lingering near New Zealand with an off-axis fetch. A coastal trough and an inland trough maintain unstable conditions with a developing N-NE flow over the weekend.
It’s a weak synoptic pattern with no major swell sources- a passing front weakens as it traverses the Tasman, leaving an off-axis fetch parallel with New Zealand. There should be enough minor swell sources of no real quality to stay wet through the short term.
The troughy pattern remains installed into the medium term so we’re still keeping an eye out for short range features which could supply local swell sources, although these look small and weak.