Typical Spring pattern with a slight La Niña/IOD twist unfolding at present. A large high is now moving into the Tasman, directing a N’ly flow along most of the Eastern seaboard. That flow intensifies in response to an approaching series of troughs and a complex low in the Bight generating some strong NE windswell for East Tas.
Primary tabs
By Thurs we’ll be lining up another round of NE swell, with plenty of size expected as an approaching complex low tightens the pressure gradient with a Tasman high and generates a powerful NE fetch down the Western Tasman Sea.
Large surf early tomorrow, easing steadily through the weekend while tending more E/NE. Follow up S swell mid-week.
The high will move E with a N’ly flow rapidly developing as pressure gradients get tightened by an approaching front, complex low and trough line, generating solid NE windswell.
This seabreeze heralds a strong N’ly flow developing off the South Coast and down to Bass Strait Thursday morning, which is expected to produce a chunky NE windswell for Thurs, under fresh NE winds.
Bit of a downgrade for next weeks surf prospects. Firstly, because the S’ly flow remains more stubbornly entrenched through Mon and Tues- although we should start seeing morning land breezes develop at least by Tues morning. Secondly, the deep polar low outbreak now really winds up a little further E (favouring California!) so we’re more exposed to sideband energy rather than the main course.
The current pattern- with weak high pressure drifting across Central NSW and a soft ridge along the coast- will be replaced in emphatic fashion by a much stronger front and trough on Friday, forming a surface low off the Mid North Coast, anchored by a monster high moving into the Bight at the same time. Well to the south of that set-up will be a deep polar low and associated fronts with severe gales to storm force winds generating long period S’ly swells to make landfall over the weekend and into early next week.
A much stronger change on Sat looks to form a low in the Central/Northern Tasman with a more substantial swell increase also being generated by a deep polar low transiting the Tasman.
A weak N/NE windswell will stop the coast going flat but next weekend looks more promising for surf.
Into the medium term and a series of deep lows and fronts amassed in the Southern Ocean look to send some small, long period refracted S swell to Tas towards the end of next week. No great size is expected due to the swell direction, so expect some 2ft days to bring in the first days of Spring.