Thunderstorm Outlook
Issued at 7:46am 15/06/2025
Valid from 7:46am 15/06/2025 to Midnight 15/06/2025
A front moves slowly north over the upper Coromandel Peninsula, Auckland and Northland today. This morning there is a low risk of thunderstorms for the north of Coromandel Peninsula, Auckland and the far southeast of Northland as indicated on the chart. This afternoon there is a low risk of thunderstorms for the far northeast of Auckland and the east of Northland. This evening and at night there is a low risk of thunderstorms for the east of Northland. Any thunderstorms may be accompanied by heavy rain, 10 to 25 mm/h. Even in the absence of thunderstorms, there could still be heavy showers. No thunderstorms or significant convection expected elsewhere.
Issued at 8:54am 15/06/2025
Valid from Midnight 15/06/2025 to Midday 16/06/2025
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.
