Weather Warnings
TownsRuralMarineMtnsMaps

Thunderstorm Outlook

Valid to Midnight Friday 19 Apr 2019
Issued at 7:20am Friday 19 Apr 2019

No thunderstorms or significant convection expected during this period.

Valid to Noon Saturday 20 Apr 2019
Issued at 9:43am Friday 19 Apr 2019

A cold front with a band of heavy rain moves northwards along the South Island west coast on Saturday morning to lie over northern Westland and the Paparoa range at midday. A period of heavy rain is expected with the front (see latest severe Weather Watch for more detail), but the risk of embedded thunderstorms is considered low.

Behind this front, conditions destabilise over the southern South Island during the morning as temperatures cool significantly aloft. This brings a moderate risk of thunderstorms to central and southern Fiordland from around dawn, and a low risk onto Stewart Island and northern Fiordland. Any thunderstorms that develop will be accompanied by brief heavy rain of 5-10mm/hr and small hail.

No other thunderstorms or significant convection expected over New Zealand on Saturday morning.

Valid to Midnight Saturday 20 Apr 2019
Issued at 9:37am Friday 19 Apr 2019

The cold front mentioned above moves northwards through Buller and western Nelson during the afternoon and evening to lie over the Marlborough Sounds at midnight. A short period of heavy rain can be expected with the front, but the risk of embedded thunderstorms is considered low.

Further south, temperatures continue to cool significantly aloft over the central and southern South Island during the second half of Saturday bringing scattered rain or showers and a few thunderstorms. As indicated on the chart, there is a moderate risk of thunderstorms over Fiordland during the afternoon and evening, and over central and southern Westland from evening. There is also a low risk of thunderstorms about Southland and Otago through the whole period, and about Mid and South Canterbury from Saturday evening. Any thunderstorms that develop will be accompanied by brief heavy rain of 5-15mm/hr and small hail.

No other thunderstorms or significant convection expected over New Zealand during this period.