"This weather system is forecast to bring a period of heavy rain to Fiordland and Westland, and northwest gales to southern New Zealand."
A strong wind watch has been issued for the Canterbury High Country from 2am to 2pm tomorrow, while wind watches also apply to Fiordland, Southland, Stewart Island and the Clutha between 6pm today and 7am tomorrow.
Queenstown Lakes, Central Otago and inland parts of North Otago and Dunedin can also expect strong winds between 9pm today and 10am tomorrow.
Here's an initial look at how the rain may unfold later this week.
You'll notice ahead of the Thursday rain (low), the west of the South Island is in for a good drop of rain and elevation snow (chiefly above 1500 m). pic.twitter.com/4Q9Kt1XPJr