People in the north of the North Island are being warned to brace for heavy rain and gales, causing flooding and slips.
The stormy weather will rapidly raise rivers and may cause surface flooding during the weekend, the MetService says.
In Northland rain up to 120mm to 180mm is expected to fall with the stormy conditions worst on Saturday night and early Sunday, Northland Civil Defence Emergency Management Group spokesman Graeme MacDonald says.
"Given that overnight rain and the fact much of Northland is still fairly soaked on the back of the storms and wet weather we've experienced over the past couple of months, the forecast rain will probably cause some flooding and possibly more slips."
Mr MacDonald said given the recent damaging storms, most Northlanders would familiar with the spots most likely to flood and would take the appropriate precautions.
Northland experienced widespread flooding and slips in July. A woman died after being swept away in floodwaters and part of State Highway 1 had to be repaired after the hill collapsed under it.
The Coromandel and Auckland are also expected to be hit by stormy conditions, the MetService says.
Winds should to ease on Sunday afternoon in Northland and on Sunday evening in Auckland.