Issued at 8:23am 12/08/2026

Valid from 8:23am 12/08/2026 to Midnight 12/08/2026

A front moves onto Northland this morning then continues to track southwards over Northland and Auckland during the second half of the day. The air-mass associated with the front is very warm and moist, especially for late winter. There is a low risk of thunderstorms for northern and eastern parts of Northland this morning, afternoon and evening. These storms could bring downpours (low risk) of 25-40 mm/h with or without lightning. The risk the extends into Auckland north of Orewa, the outer Hauraki Gulf, Great Barrier Island and northern Coromandel Peninsula later in the evening and at night as indicated on the chart. Elsewhere, there is minimal risk of thunderstorms or significant convection expected during this period.

Issued at 9:01am 12/08/2026

Valid from Midnight 12/08/2026 to Midday 13/08/2026

The front continues to move east over the North Island, to lie over central Bay of Plenty by midday Thursday. The air-mass associated with the front is very warm and moist, especially for late winter. There is a low risk of thunderstorms for Great Barrier Island and northern and central Coromandel Peninsula before dawn and for southern Coromandel Peninsula and Bay of Plenty west of Opotiki for the whole period as indicated on the chart. These storms could bring downpours (low risk) of 25-40 mm/h with or without lightning. A trough moves onto the west of the upper South Island during the morning, and there is an associated low risk of thunderstorms for western parts of Buller, Grey and northern Westland districts as indicated on the chart. Elsewhere, there is minimal risk of thunderstorms or significant convection expected during this period.

Issued at 9:15am 12/08/2026

Valid from Midday 13/08/2026 to Midnight 13/08/2026

The front becomes slow moving over eastern Bay of Plenty during the second half of Thursday. There is a low risk of thunderstorms for Bay of Plenty between Tauranga and Opotiki during the afternoon and for Bay of Plenty about and east of Opotiki and for northern Gisborne/Tairawhiti for the whole of the period as indicated on the chart. West of Opotiki, these storms could bring downpours (low risk) of 25-40 mm/h with or without lightning. The trough clears western parts of the upper South Island during the afternoon, and there is an associated low risk of thunderstorms for western parts of Buller, Grey and northern Westland districts as indicated on the chart. Elsewhere, there is minimal risk of thunderstorms or significant convection expected during this period.