Thunderstorm Outlook
Issued at 7:32am 12/11/2026
Valid from 7:32am 12/11/2026 to 1:00am 13/11/2026
There is minimal risk of thunderstorms or significant convection during this period.
Issued at 8:07pm 12/11/2026
Valid from 1:00am 13/11/2026 to 1:00pm 13/11/2026
There is minimal risk of thunderstorms or significant convection during this period.
Issued at 10:03am 12/11/2026
Valid from 1:00pm 13/11/2026 to 1:00am 14/11/2026
A slow-moving high lies over the country. During the afternoon, sea breezes are expected to develop in many places. Over Northland, convergence of sea breezes is expected to produce some showers and there is a low risk of thunderstorms during the afternoon and evening. Elsewhere, the risk of severe convection or thunderstorms is minimal.
Severe Thunderstorm Criteria
In New Zealand, MetService classifies a thunderstorm as severe if one or more of the following criteria are met:
Heavy rain (from thunderstorms):
Rainfall of 25mm/h, or more.
Large hail:
Hailstones 20mm in diameter, or larger.
Strong wind gusts (from thunderstorms):
Gusts of 110km/h (60 knots) or stronger.
Damaging tornadoes:
Fujita F1 - i.e. wind speeds greater than 116km/h (63 knots) or stronger.
Note: some tornadic systems such as funnel clouds, waterspouts and small land-based tornadoes are possible with thunderstorms that may not be classified as severe.
