Issued at 7:31am 29/07/2026

Valid from 7:31am 29/07/2026 to Midnight 29/07/2026

A moist northerly flow covers the South Island. There is a low risk of thunderstorms with heavy rain for Fiordland during the latter half of the day, as indicated on the chart. There is minimal risk of thunderstorms or significant convection elsewhere in New Zealand during this period.

Issued at 7:27pm 29/07/2026

Valid from Midnight 29/07/2026 to Midday 30/07/2026

A front, preceded by a moist northerly flow, is expected to move east onto Fiordland late Thursday morning. There is a low risk of thunderstorms about Fiordland and the ranges of South Westland south of Haast, which increases to moderate about Fiordland later in the morning, bringing a risk of localised heavy rain of 10 to 25mm/hr. There is minimal risk of thunderstorms or significant convection over the remainder of Aotearoa New Zealand during this period.

Issued at 9:03am 29/07/2026

Valid from Midday 30/07/2026 to Midnight 30/07/2026

The front moves east over the South Island during the afternoon and evening to reach Taranaki and Marlborough Sounds by midnight. A series of troughs follow this front affecting Fiordland and Westland. The leading front brings a moderate risk of thunderstorms to Westland during the afternoon then Grey and Buller into the evening and night, bringing localised heavy rain of 10 to 25 mm/hr. Troughs behind this front, bring a moderate risk of thunderstorms about Fiordland, which reach Westland in the evening and night, bringing the risk of localised heavy rain of 10 to 15 mm/hr and small hail. These thunderstorms may also be squally about coastal parts of Fiordland and Westland with gusts of 80 to 90 km/hr. In addition, there is a broader low risk area just east of the Alps and about Stewart Island during the period, then about Marlborough Sounds and Taranaki at night. For remaining parts of Aotearoa New Zealand there is minimal risk of thunderstorms or significant convection during the period.