A trough in the Tasman off the NSW coast deepens into a small, surface low through Tuesday. Compared to model runs on Friday, this slow moving low is now positioned further south, in a more favourable position for swell generation for the East Coast of Tas.
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NE windswell is on the way out through tomorrow as the fetch gets shunted eastwards and away from the swell window but a complex cut-off low quickly replaces that swell with chunky short range S swell as it tracks just to the East of Tasmania and brings strong to gale force SSW to S winds.
Intensifying pressure gradients between a 1025 hPa high East of Tasmania and an approaching complex mid-latitude cut-off low is seeing N to NE winds begin to freshen across Bass Strait tonight.
High pressure drifts across the Tasman from a position in Tasmanian latitudes this week. An approaching mid-latitude low in the Bight tightens the the pressure gradient along the western flank of the high in the Tasman, with an increase in N to NE winds off NSW coast through Wed. It’s Thursday and Friday that really muscle up with gales aimed directly at NETas.
A much more solid swell event then unfolds through the second half of next week , with a high pressure system drifting in the lower Tasman towards the South Island and a strong N’ly fetch developing off the back of the high, with pressure gradients being tightened by an approaching mid-latitude low in the Bight.
Things get more interesting next week, as instability in the Tasman sea leads to some surf potential for the East coast of Tas.
The low near the South Island has had a fetch of ESE winds towards Tasmania, not ideally aligned but radial spread from the source fetch should see surf in the fun size range through Tuesday.
An inland low and offshore trough are generating a mix of NE winds and more proximate E’ly winds both in the Eastern Tas swell window. Onshore winds have been associated with the approaching low.
Still on track for some large, windy surf for the NE coast as an approaching low pressure system focusses an infeed of E’ly winds onto the coast and an associated NE fetch in the Tasman, adjacent to the NSW coast sends NE swell towards Tasmania.
Tempestuous, windy week ahead for the region with a dominant high moving NE into the Tasman, generating NE windswell before an inland low approaches and brings strong onshore winds and large seas and swell.