In Gisborne, heavy rain may cause streams and rivers to rise rapidly. Surface flooding and slips are also possible and driving conditions may be hazardous, said MetService.
Overnight, Gisborne could notch up a further 50 to 70mm of rain on top of what has already fallen. Thunderstorms are also on the cards.
The Chatham Islands are also in for a battering from winds approaching severe gale in exposed places from tomorrow afternoon until Friday morning.
MetService said the weather is being driven by a complex low and associated fronts forecast to move southeast across northern New Zealand tonight and tomorrow.
A heavy rain warning remains in place for the far north of Gisborne
Heavy Rain Watch
Area: Coromandel Peninsula
Valid: 12 hours from 6:00pm Wednesday to 6:00am Thursday
Forecast: Periods of rain. Rainfall accumulations may approach warning criteria.
Strong Wind Watch
Area: Northland
Valid: 16 hours from 2:00pm Thursday to 6:00am Friday
Forecast: Southwest gales may become severe in exposed places.
Area: Auckland, Great Barrier Island
Valid: 10 hours from 8:00pm Thursday to 6:00am Friday
Forecast: Southwest gales may become severe in exposed places.
Area: The Chatham Islands
Valid: 14 hours from 4:00pm Thursday to 6:00am Friday
Forecast: Northeasterly winds may approach severe gale in exposed parts at times.
Area: Gisborne north of Ruatoria
Valid: 6:00pm Wednesday to 6:00am Thursday. Periods of heavy rain.
Source: MetService severe weather watch