Ex TC Gabrielle is still the main game as far as swell production goes. The former cyclone is now a large sub-tropical storm (SS) slow moving near the top of the North Island. Current ASCAT (satellite windspeed) passes show a broad but short fetch of gales to severe gales extending off the west coast of the North Island, slightly off axis for the East Coast but maintaining a strong swell regime in the short term.
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Severe tropical cyclone (Cat3) Gabrielle is currently tracking SE at about 21 knots and is located about 413 nm NE of Brisbane. Early incarnations of the TC as it was drifting SW showed a fetch of storm force to severe gale NE winds around the NE quadrant which is producing a rare NNE-NE long period swell
We should start to see some long period N/NE swell appear, generated by the early stages of TC Gabrielle (developing tonight, actually).
A convective cloud mass between the Solomon Islands and Vanuatu is expected to consolidate and deepen into a tropical cyclone by mid week, tracking back into the Coral Sea towards the tropical QLD coast before recurving and drifting Southwards through the Coral Sea and eventually towards the North Island. Solid swell from this system is expected across most of the Eastern Seaboard
There’s a myriad of swell sources for next week.
The unstable pattern continues with a small trough of low pressure lingering off the Central NSW Coast, linked to tropical cloud bands and moisture streaming in from the Northern Monsoon. This unstable, humid pattern lasts through the week before a winter-calibre mid-latitude low blasts a clearing W’ly flow across temperate NSW, with a S’ly change for the sub-tropics. Small, funky E swells maintain surfable conditions through the f/cast period.
We’ve got a troughy, unstable synoptic pattern on our hands with monsoonal clouds and moisture extending from the Top End dawn to a trough off the NSW South Coast. Weak pressure gradients look to be with us for a few days as the trough lingers about the NSW Central/Mid North Coast, possibly forming a small low. Small pulses of E swell generated by fetches near the North Island supply some fun sized surf if you can work around the shifty winds expected this week.
Weak high pressure is rapidly moving SE into the Tasman in the wake of yesterdays trough, which has stalled just north of the Hunter coast. E’ly fetches are still bubbling away near the North Island with more small E quadrant swell expected over the short/medium term.
The synoptic pattern over and surrounding Australia still has a strong La Niña signature with troughy low pressure areas in the Tasman Sea and an active monsoon trough across Northern Australia. High pressure on the other side of New Zealand is cradling areas of low pressure and maintaining a small, fun E swell signal.
A troughy pattern exists through the Northern Tasman down to the South Coast with the remnants of TC 10P (named by JTWC but remained a cyclone for less than a day) drifting in a SW direction from out near New Caledonia as a weak sub-tropical low. A small low pressure cell near the South Coast is slowly drifting south leaving a variable flow in it’s wake across the f/cast region.