Severe Weather Warning Get File

Severe Weather Warning


Issued by MetService at 8:21pm Saturday 23-Sep-2017

Heavy rain for the west of the South Island from Sunday evening, plus severe northwest gales for Canterbury

A very strong and moist northwest flow spreads onto New Zealand during Sunday, which persists until at least Tuesday. An embedded front will bring a burst of heavy rain to western areas as it moves slowly northwards from Sunday evening with significant spillover rain into the headwaters of Otago Lakes and Rivers. A period of northwest gales are also forecast for much of southern and central New Zealand ahead of this front.

Heavy Rain Warning

Heavy rain may cause streams and rivers to rise rapidly. Surface flooding and slips are also possible and driving conditions may be hazardous.

Area: Westland south of Hokitika
Valid: 16 hours from 9:00pm Sunday to 1:00pm Monday
Forecast: From Sunday evening to Monday afternoon, expect 120 to 160 mm of rain about the ranges, and 40 to 70 mm nearer the coast. Peak rates of 25 to 35 mm/hr expected during Monday morning about the ranges, especially in thunderstorms.

Area: Otago Headwaters
Valid: 9 hours from 9:00pm Sunday to 6:00am Monday
Forecast: From Sunday evening to early Monday morning, expect 100 mm near the main divide and 60 to 80 mm within 20km east of the divide. Peak rates of 20 to 30 mm/hr, especially in thunderstorms.
Freezing level 2200 metres.

Area: Fiordland
Valid: 25 hours from 6:00pm Sunday to 7:00pm Monday
Forecast: From Sunday evening to Monday evening, expect 120 to 160 mm of rain. Note, 70 to 110 mm will likely fall in the 6 hour period from 9pm Sunday to 3am Monday. Peak rates of 25 to 35 mm/hr during this time, especially in thunderstorms.

Strong Wind Warning

Strong wind gusts could damage trees, powerlines and unsecured structures. Driving may be hazardous, especially for high-sided vehicles and motorcycles.

Area: Canterbury
Valid: 15 hours from 6:00pm Sunday to 9:00am Monday
Forecast: From Sunday evening to Monday morning, northwest gales are forecast to be severe gusting 130 km/h at times, especially inland and about higher parts of Banks Peninsula.


This warning will be updated by: 10:00am Sunday 24-Sep-2017

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Before making decisions based on this data
please see the information at metservice.com who are the providers of this data