On Friday, a deep low lies near the Chatham Islands, although it is not depicted on the chart, there is low confidence that easterly winds may reach severe gale at the Chatham Islands during Friday morning.
A ridge should push eastwards across New Zealand on Friday. On Saturday and early Sunday a trough of low pressure is expected to move eastwards across New Zealand, bringing a period of rain or showers to much of the country. There is low confidence of rainfall reaching warning amounts over the southern and central ranges of Westland, and western parts of Tasman, on Saturday. Another ridge is forecast to spread across New Zealand late Sunday and Monday.