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Thunderstorm Outlook

Issued at 7:41am 22/06/2021

Valid from 7:41am 22/06/2021 to Midnight 22/06/2021

No thunderstorms or significant convection expected during this period.

Thunderstorm Outlook for New Zealand

Issued at 9:08am 22/06/2021

Valid from Midnight 22/06/2021 to Midday 23/06/2021

No thunderstorms or significant convection expected 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.