Thunderstorms are expected across parts of the North Island tonight.

Predicted thunderstorms could bring heavy rain, hail, strong winds and small tornados to parts of the North Island, MetService has warned.

MetService issued a severe thunderstorm watch on Sunday and said an active front was expected to reach Taranaki late in the afternoon and then cross the North Island during the evening.

It said there was also a moderate risk a few of the thunderstorms could become severe, producing damaging winds of 110kmh or stronger or a damaging tornado.

MetService Thunderstorms will move across the North Island from the afternoon into the evening.

"Thunderstorms are likely with and following the front, these thunderstorms will bring heavy rain or showers, strong winds gusting 100kmh, hail and the risk of a small tornado," MetService said.

"If any tornados occur, they will only affect very localised areas."

It warned the winds could cause structural damage to trees and powerlines and make driving dangerous.

MetService said those living in Taranaki, Northland, Auckland, Great Barrier Island, Coromandel Peninsula, Waikato, Waitomo, Taumarunui, Bay of Plenty, Rotorua to keep needed to keep an eye out for changes in the weather.

Taranaki Civil Defence also issued a warning on its Facebook page.

"We're expecting some bad weather late this afternoon moving into evening in the region. Thunderstorms are predicted with strong winds and possible localised tornadoes," it posted.

"Might be a good idea to check your emergency supplies in case the power goes out and tie down the tramp so it doesn't end up down the road. Head to www.getthru.govt.nz to see more about preparing for storms and we'll keep you updated if we get any more info."