A heavy rain warning is in place for the Bay of Plenty west of Whakatane, including Rotorua.
The MetService has also issued a severe weather watch for several other parts of the country, including the Coromandel Peninsula.
The watch means there is a possibity of rainfall reaching warning levels of 60-70mm with 9 to 12 hours or 85mm in 18 hours in the areas from early tomorrow morning to early Wednesday night.
A complex low over the Tasman Sea and its associated fronts were forecast to affect many parts of the country during that period.
For the area west of Whakatane, rainfall was expected to become heavy from midday tomorrow and ease late Wednesday night.
