In this special Saturday update we track the low north of NZ that is expected to develop into a storm east of the North Island across Sunday and going into Monday.

Heaviest rain is likely to be in the eastern side of North Island and the southern half of the North Island and down to Marlborough and Canterbury in the South Island.

We show you the latest tracking, rainfall, damaging winds – and the expected wave heights at their peak.

Also, a longer range look towards the end of next week – plus Phil explains why lows north-east of NZ are triggering into larger systems at the moment.

We will update again on Sunday.

Keep up to date with MetService warnings – as rainfall maps are only a guide, and localised downpours can always create more rain than is forecast, as we saw overnight in Waikato.