Issued at 7:20am 9/08/2026

Valid from 7:20am 9/08/2026 to Midnight 9/08/2026

A low, moving slowly southeast, is expected to cross the South Island today. Fronts associated with the low should pass over the northern South Island and the North Island. A low risk of thunderstorms exists for the day in Taranaki, western Tasman, Buller, Grey and Westland. For Buller, Grey and northern Westland, this risk rises to moderate at times this afternoon and again tonight. If thunderstorms occur, they may be accompanied by localised heavy rain with intensities of 15 to 25 mm per hour and small hail. The low risk of thunderstorms extends eastwards to inland areas of Marlborough and North and Mid Canterbury during the afternoon and evening, and into coastal areas of Whanganui, Manawatu, Horowhenua, Kapiti and north Wellington this evening and tonight. There is also a low risk of thunderstorms about Northland, the outer Hauraki Gulf (including Great Barrier Island), Coromandel Peninsula and Bay of Plenty from Whakatane westwards this morning until mid-evening. These thunderstorms may bring localised heavy rain, and for Northland there is a low risk of downpours of 25 to 40 mm per hour. For Bay of Plenty east of Whakatane and northern Gisborne/Tairawhiti there is a low risk of thunderstorms from this afternoon through to tonight. The risk of thunderstorms or severe convection elsewhere is minimal.

Issued at 10:27am 9/08/2026

Valid from Midnight 9/08/2026 to Midday 10/08/2026

A low just east of the South Island moves slowly east and crosses the Chatham Islands in the afternoon. Before dawn, there is a moderate risk of thunderstorms about western Tasman, Buller and Grey with a low risk slightly further east and also about northern Westland. If these thunderstorms occur, they may be accompanied by localised heavy rain with intensities of 10 to 20 mm per hour and small hail. There is a low risk of thunderstorms about coastal areas from South Taranaki to northern Wellington until mid-morning. For eastern Bay of Plenty and northern Gisborne/Tairawhiti there is a low risk of thunderstorms before dawn. Not shown on the chart, there is also a low risk of thunderstorms about the Chatham Islands. Elsewhere, the risk of thunderstorms or severe convection is minimal.