MetService says thunderstorms are possible this afternoon and evening along the South Island's West Coast as well as Auckland and Northland.
The highest chance of thunderstorms and strong winds gusting to 90km/h is along the West Coast all the way south to Fiordland.
Similar chances exist just north in the Tasman area, with small hail possible in both areas from this evening.
In the North Island, there's a moderate chance of thunderstorms in both Northland and Auckland, which could bring heavy rain reach up to 20mm per hour.
A little further south around Taranaki and parts of Waikato, there is a low chance of storms.
For a full forecast for your region, see our weather page here.