The broad supporting fetch of SSE/SE winds is better aimed at the East Coast but not especially strong and the system is quite mobile, drifting away through today and briefly flaring up tomorrow as it moves over New Zealand overnight Thursday.
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This low and a slow moving high pressure cell- now drifting across the Bight and expected to track over Tasmania mid-week will hold a pattern of S’ly winds and developing SE swell through the week.
Tuesday is where model divergence becomes apparent. A SE/NW angled trough in the Tasman is likely to deepen on Tuesday 14/9, possibly forming a surface low. GFS model has this low forming off the Central NSW coast, EC forms a low much further north in the Tasman, close to Norfolk Island, with a very different surf outlook from Tuesday onwards.
Not much change expected from Mon’s f/cast notes apart from the timing on the expected long period S pulse over the next 24hrs. ASCAT (satellite windspeed) passes showed plenty of storm force winds associated with the deep low as it transited the Tasman overnight and into this morning.
This swell will be generated by a deep low centred around 50S which is expected to track south of Tasmania, with a slight NE wobble as it transits the Tasman on Tuesday. This is a powerful storm, with storm force winds and a large area of seas in excess of 30ft, and as a result swell periods will be in excess of 15s which will produce some real bathymetric focussing effects on deepwater reefs through Wed PM as swell trains get tripped up.
By Mon morning the Tasman sea will be inflamed with severe gale to potentially storm force winds, as a robust low and reinforcing cold front push into the lower Tasman.
Spring starts with pattern change and an unstable, dynamic synoptic outlook with several swell sources incoming.
The surf will continue to fade into the middle of the week ahead of building surf from the east-northeast on the weekend and more so next week.
Current ASCAT (satellite windspeed) passes show our Tasman low in a great place, slowly drifting E of Tasmania towards New Zealand, maintaining a nice pressure gradient squeeze with a high pressure cell SE of Tasmania. As expected, the low has filled in a bit, with a corresponding lessening of windspeeds, mostly low end gales, compared to the storm force winds of it’s “bombing” phase.
The Tasman low finally moves into better position later Thurs into Fri, weakening as it does so. The weekend still looks great though, just smaller due to the declining windspeeds on the SW flank of the low, compared to Monday’s notes.