The remnants of the Tasman Low (ex ECL) are now drifting near the South Island, on top of a large high which is slowly moving out of the Tasman Sea. A high is approaching from the South Australian interior, with a trough expected to form off the coast later Tues and develop a broad, relatively weak low in the Central/Northern Tasman.

A massive cloud-band is enveloping most of the Eastern Seaboard, tied to a complex low pressure system in the Tasman, and strong high pressure system with both systems slow moving. Multiple trough lines also complicate the situation, leading to uncertain movements of the main low, and development of secondary low pressure centres, of which one is forming off the Mid North Coast today (between Coffs and Port Macquarie).

By Wednesday it looks like a classic La Niña map. Strong high just SE of Tasmania with a low in the Central Tasman directing a huge windfield through most of the Central to Northern Tasman Sea. 

A complex trough spanning much of the East Coast will develop over the next few days, of which the latest model guidance is pointing towards a significant easterly trough low (that may become an ECL) slowly evolving from Saturday through the first half of next week.