A front is moving northwards across Waikato and Auckland this morning, with a low risk of a few elevated thunderstorms. No thunderstorms or severe convection expected over the remainder of New Zealand.

An unstable northwest flow affects the southwest of the South Island, bringing periods of heavy rain to Fiordland and South Westland along with a moderate risk of thunderstorms. These thunderstorms may produce localised rainfall rates of 10 to 25mm/hr and small hail. A low risk of thunderstorms extends over Stewart island, and the far west of Southland and Otago. No thunderstorms or significant convection expected elsewhere during this period.

An unstable northwest flow persists across the west of the South Island through the second half of Friday. The trough should move across Westland in the afternoon with a burst of heavy rain and a moderate risk of thunderstorms, while a low risk of thunderstorms persists in Fiordland. In the evening, temperatures aloft over Fiordland cool further, and the risk of thunderstorms there becomes moderate. These thunderstorms may produce localised rainfall rates of 10 to 20mm/hr and small hail. A low risk of thunderstorms extends over Stewart Island, and also far western parts of Southland, Southern Lakes and Canterbury High Country. Afternoon and early evening wind convergence should produce showers over Dunedin, North Otago, and the far south of Canterbury, and there is a low risk of thunderstorms in this area. No thunderstorms or significant convection expected elsewhere during this period.