Thunderstorm Outlook
Issued at 7:55am 9/06/2026
Valid from 7:55am 9/06/2026 to Midnight 9/06/2026
There is minimal risk of thunderstorms or significant convection during this period. A showery southwesterly flow brings a moderate risk of thunderstorms with heavy rain to the Chatham Islands till around noon today. There is minimal risk of thunderstorms elsewhere in New Zealand during this period.
Issued at 9:12am 9/06/2026
Valid from Midnight 9/06/2026 to Midday 10/06/2026
There is minimal risk of thunderstorms or significant convection during this period.
Issued at 9:08am 9/06/2026
Valid from Midday 10/06/2026 to Midnight 10/06/2026
There is minimal risk of thunderstorms or significant convection 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.
