An orange heavy rain warning has been issued for the Coromandel region.
The warning comes into force from 10pm tonight through to 10pm Friday.
MetService said 120mm to 150mm of rain could fall with intensities of 15mm to 25mm per hour, possibly even more in localised downpours, especially during Friday morning.
It warned that heavy rain may cause streams and rivers to rise rapidly, slips, surface flooding and hazardous driving conditions.
A strong wind watch is also in place for the Coromandel Peninsula and Waikato, about and just west of the Kaimai Range, from 2am Friday through to 3pm Friday.