This trough of low pressure deepens into a surface low in the Tasman and is expected to track in a northerly direction through the short term. The initial spike in short range S swell will be reinforced by better quality S/SE swells late this week into the weekend.

Latest model runs have amplified this trough and a resulting trough of low pressure in the Tasman. There’s still some model divergence to get through so expect some revisions but odds are firming off a sizey S tending S/SE swell event from Wed, as the trough deepens in the Central Tasman. 

A very weak troughy pattern is unfolding this week with a weak high pressure (1016hPa) cell moving into the Tasman today as a trough stalls about the Far North Coast. Another trough tomorrow brings a shallow S’ly change which again looks to stall out on the North Coast before another weak high cell moves into the Tasman late this week. In short, no major swells expected.

Some decaying and fast moving frontal activity in the lower Tasman is currently scooting across that sea. Once the new high sets up shop in the Tasman we’ll see the N-NE flow which has been a constant for a month reset until another S’ly change arrives on the weekend. No major swells ahead as the pattern of weak, mobile high pressure continues but there’ll be some windows of opportunity with small NE windswell and minor flushes of S swell.