The country is expected to take a battering with heavy rain and thundery downpours are set to dominate the weather from Sunday.
MetService has issued a severe weather warning for Taranaki this morning, as an unsettled northwesterly flow crosses the country from tomorrow.
The heaviest rain falls are expected on Sunday and Monday in Taranaki, where 250 to 350mm of rain may fall over higher slopes of Mount Taranaki. And MetService said this rain is likely to be accompanied by squally thunderstorms.
Elsewhere heavy falls are likely in Westland, Buller, western Nelson, north Wellington, Horowhenua, Kapiti Coast, and the Tararua Range after noon tomorrow and Monday.
Periods of thundery rain are also forecast from about midday Sunday for the central North Island hill country.
This affects areas from the headwaters of the Whanganui River across to Tongariro.
MetService said the weather is being caused by a broad trough over the Tasman Sea which is forecast to move slowly eastwards across New Zealand from later today through to late Monday.
MetService said rivers and streams may rise rapidly, and slips, surface and flash flooding were possible.