Thunderstorm Outlook
Issued at 7:07am 10/06/2026
Valid from 7:07am 10/06/2026 to Midnight 10/06/2026
There is minimal risk of thunderstorms or significant convection during this period.
Issued at 7:20pm 10/06/2026
Valid from Midnight 10/06/2026 to Midday 11/06/2026
There is minimal risk of thunderstorms or significant convection during this period.
Issued at 9:19am 10/06/2026
Valid from Midday 11/06/2026 to Midnight 11/06/2026
A front moves onto the south of the South Island late Thursday. There is an associated low risk of thunderstorms with heavy rain in Fiordland and about Stewart Island in the evening and at night. There minimal risk of thunderstorms or significant convection elsewhere in New Zealand during this period.
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.
