A complex inland trough low tied to tropical sources exits the coast as a strong high moves into the Bight. Following that a coastal trough in the Northern Tasman then deepens, likely into a surface low which may drift southwards bringing strong E swells to the entire region, possibly followed by a return S swell as the low gets captured by an approaching front.
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From Wed onwards we’ll see a much more dynamic pattern in the Tasman. The inland low will exit near the Gippsland coast and conjoin with a front as a major new high pushes in behind from the Bight.
Weak coastal troughiness will contract to the North Coast on Thursday though lingering onshore SE winds are a risk north from Sydney.
For now, frontal activity is being allowed to track in a more favourable manner for S swell production so we’ll seea week of small/moderate S swell pulses leading into the Easter weekend.
For now, frontal activity is being allowed to track in a more favourable manner for S swell production so we’ll see a week of small/moderate S swell pulses leading into the Easter weekend.
S swells from frontal activity now look a notch more active next week as the W-E progression of the next high cell (and subsequently fronts) slows and allows more intrusion into the lower Tasman.
The NZ high has generated a useful fetch of tradewinds in the eastern swell window, which has maintained E’ly swells in the sub-tropics, E/NE in temperate regions. That trade fetch breaks down in the short term before rebuilding again at more Northern latitudes. We’ll see some frontal activity over the weekend before another strong, blocking high sets up a ridge next week.
We’ll see this pattern disrupted mid-week by an aggressive trough which brings S winds and swell before the next high slowly resets the trade pattern, this time further north in the Coral Sea.
Today’s onshore pattern will contract to the North Coast on Saturday, and Sunday looks very interesting with a new long period S/SE groundswell.
We’ve still got a broad trade wind flow in the Coral Sea, extending out into the South Pacific and anchored head and tail by low pressure along the monsoon trough. That’s producing heavy swells in the sub-tropics (full blown Point surf equivalent to cyclone swells) with a fair amount filtering down to temperate NSW.