Issued at 1:11pm 25/06/2025

Valid from 1:11pm 25/06/2025 to Midnight 25/06/2025

A front, preceded by a strong moist northerly flow, moves onto Fiordland this afternoon and evening with heavy rain. There is an associated low risk of thunderstorms for Fiordland and southern Westland, however the risk of thunderstorms is considered moderate for Fiordland this afternoon and evening. No thunderstorms or significant convection expected elsewhere during this period.

Issued at 7:55pm 25/06/2025

Valid from Midnight 25/06/2025 to Midday 26/06/2025

An active front is expected to move across the South Island West Coast during the morning, bringing a period of heavy rain as detailed in the latest Severe Weather Warning. There is a moderate risk of thunderstorms with this front from central Westland to western Tasman during the morning, including areas near the Southern Alps. An unstable showery northwest flow affects Stewart Island, Fiordland and southern Westland behind the front, bringing a moderate risk of thunderstorms with localised rainfall rates of 10 to 25 mm/h and small hail. A low risk of thunderstorms extends across western parts of Southland, Otago, Canterbury and Nelson. No thunderstorms or significant convection expected elsewhere during this period.

Issued at 9:09am 25/06/2025

Valid from Midday 26/06/2025 to Midnight 26/06/2025

An active front lies slow moving across the top of the South Island, bringing heavy rain as detailed in the Severe Weather Warning. There is a moderate risk of thunderstorms over the Grey District and Buller in the afternoon, and western Tasman throughout the period. A low risk of thunderstorms extends over the remainder of Nelson and about the Southern Alps as shown on the chart. Behind the front, an unstable northerly flow affects the lower South Island, while a front moves onto the far south bringing a southwest change. There is a low risk of a few thunderstorms from Westland to Fiordland, also Southland, Stewart Island and Clutha, however the risk of thunderstorms is considered moderate over Fiordland in the early afternoon with localised heavy rain and small hail. In addition, a showery northerly flow over Northland becomes more unstable from evening, with a low risk of thunderstorms there. No thunderstorms or significant convection expected elsewhere during this period.