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 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 expected to form off the Mid North Coast today.

OK, here we go. We are starting to get some model agreement on a developing easterly trough low expected to form off the Sydney/Hunter coast through tomorrow. There’s still a degree of uncertainty as to the exact position of the low axis, which will make wind f/casts a bit rubbery and really, coming down to a game of kilometres. 

A monster high moving well south of the Bight is expected to rapidly set up a strong ridge along the NSW Coast. Cradled by this ridge will be a very complex series of low pressure troughs, including an interior trough and a broad trough in the Coral Sea, with a potential surface low forming off the QLD or NSW Coast.