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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.

Thunderstorm Outlook for New Zealand

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.

Thunderstorm Outlook for New Zealand

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.

Thunderstorm Outlook for New Zealand

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.