Thunderstorm Outlook
Issued at 7:25am 16/06/2025
Valid from 7:25am 16/06/2025 to Midnight 16/06/2025
Showers keep affecting the upper North Island during Monday in a cool, unstable southeasterly flow. This afternoon and evening, there is a low risk of a few thunderstorms over eastern and northern Northland. No thunderstorms or significant convection expected elsewhere.
Issued at 9:26am 16/06/2025
Valid from Midnight 16/06/2025 to Midday 17/06/2025
No thunderstorms or significant convection expected 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.
