After a binary interaction between the two systems, the merged low transitions into a storm force sub-tropical low which tracks SW into the Northern Tasman. This storm force low has a broad fetch aimed directly at the East Coast, generating a large E’ly quadrant swell for Good Friday and the Easter weekend with uncommonly large swell periods for swells from that direction.

A tropical depression between Vanuatu and New Caledonia has formed a tropical cyclone (TC Tam) and is racing south-eastwards at 23kts, where it is expected to merge with another tropical low SW of New Caledonia. After a binary interaction between the two systems, the merged low transitions into a storm force sub-tropical low which tracks SW into the Northern Tasman.

New swell due for the weekend, with a good, long-range swell for next week.

Certainly by Wed into Thurs the synoptic chart should look insane with a deep low (970-980hPa) retrograding into the Tasman, positioned inside the North island with plenty of space for severe gale to low end storm force winds to be aimed up at the east coast.