Severe Weather Outlook
Issued: 10:42am Friday 14 Aug 2026
Valid Sunday 16-Aug-2026
There is moderate confidence that rainfall accumulations will meet warning criteria over the Wairoa District and about Gisborne/Tairawhiti south of Gisborne city throughout the day. There is low confidence that a heavy rain warning will be required for Wairarapa during the morning.
In addition, there is low confidence that a warning will be required for severe south to southeast gales about the Marlborough Sounds, Wellington, Kapiti Coast and southern and western Taranaki during the morning and afternoon. There is also low confidence of severe southeast gales for the ranges of northern Hawke's Bay and Gisborne/Tairawhiti, and also about eastern Bay of Plenty from midday onwards.
Valid Monday 17-Aug-2026
There is moderate confidence that a heavy rain warning will be required for the Wairoa District and about Gisborne/Tairawhiti south of Gisborne city during the morning.
In addition, there is low confidence of severe southeast gales for the ranges of northern Hawke's Bay and Gisborne/Tairawhiti, and also about eastern Bay of Plenty during the morning.
Valid Tuesday 18-Aug-2026
There is minimal risk of severe weather.
Valid Wednesday 19-Aug-2026
There is minimal risk of severe weather.
Low confidence:
A 20% likelihood (or 1 chance in 5) of a warning being issued.
Moderate confidence:
A 40% likelihood (or 2 chances in 5) of a warning being issued.
High confidence:
a 60% likelihood (or 3 chances in 5) of a warning being issued.
New issues of this forecast are made available on this site at or before 16:30 NZST
Thunderstorm Outlook
Valid to Midnight Friday, 14-Aug-2026
Issued: 8:24am Friday 14 Aug 2026
Valid to Noon Saturday, 15-Aug-2026
Issued: 10:16am Friday 14 Aug 2026
Valid to Midnight Saturday, 15-Aug-2026
Issued: 10:21am Friday 14 Aug 2026
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 25 millimetres per hour, or more.
Large hail:
Hailstones 20 millimetres in diameter, or larger.
Strong wind gusts (from thunderstorms):
Gusts of 110 kilometres per hour / 60 knots or stronger.
Damaging tornadoes:
Fujita F1 (wind speeds greater than 116 kilometres per hour / 63 knots) or stronger.