Regional News & Alerts


Severe Weather Warning

Significant heavy rain for the northwest of the South Island

Multiple fronts embedded within a strong moist north to northeast flow affect the country from Tuesday through into early Friday, bringing heavy rain and gales to the north and west of both islands. This flow should ease during Friday as a ridge of high pressure builds over the upper North Island. Meanwhile, a slow-moving ridge builds over the lower South Island from early Wednesday. See latest Severe Weather Warnings and Watches at www.metservice.com.

There is high confidence of rainfall reaching warning amounts over Buller, Tasman and Nelson, and northern Marlborough from Tuesday through into Thursday, with confidence reducing to low early Friday. There is also high confidence a heavy rain warning will be required for Westland on Tuesday and Wednesday, with confidence reducing to moderate on Thursday. On Wednesday and Thursday, there is moderate confidence of heavy rain about western parts of Marlborough and the headwaters of the Canterbury lakes and rivers as indicated on the chart.

For Mount Taranaki, there is high confidence of rainfall reaching warning amounts from Wednesday into Friday, while for the remainder of Taranaki, the Whanganui headwaters and Taihape, there is moderate confidence of heavy rain on Thursday and Friday. There is low confidence that a heavy rain warning will be required for southern parts of Northland, Auckland, Coromandel Peninsula and Bay of Plenty on Thursday, while for the Tararua Range there is low confidence on Thursday and Friday.

Additionally, there is moderate confidence of severe gale north to northeasterlies for much of Northland late Wednesday and Thursday, with low confidence for southern Northland, Auckland, Coromandel Peninsula, Taranaki, Central North Island High Country, Wellington, Marlborough Sounds, Nelson and Tasman, and northern Buller on Thursday.

Heavy Rain Warning

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

Area: Mount Taranaki

Period: 36hrs from 6pm Wed, 17 Aug – 6am Fri, 19 Aug

Forecast: Expect 250 to 350 mm of rain to accumulate. Peak rates of 15 to 25 mm/h.

Area: The Tasman District west of Motueka

Period: 61hrs from 5am Tue, 16 Aug – 6pm Thu, 18 Aug

Forecast: Periods of heavy rain. Expect 400 to 650 mm of rain to accumulate about the ranges, and 150 to 250 mm about low lying areas. Some models indicate 700 to 800 mm about the ranges during this period. Peak rates of 10 to 15 mm/h about the ranges on Tuesday, then 15 to 25 mm/h during Wednesday and Thursday.

 

Area: The Marlborough Sounds, Bryant and Richmond ranges, including the Rai Valley

Period: 56hrs from 1pm Tue, 16 Aug – 9pm Thu, 18 Aug

Forecast: Periods of heavy rain. Expect 300 to 450 mm of rain to accumulate about the ranges, and 150 to 250 mm about the Sounds. Peak rates of 10 to 15 mm/h about the ranges.

Area: Buller

Period: 62hrs from 4am Tue, 16 Aug – 6pm Thu, 18 Aug

Forecast: Periods of heavy rain. Expect 300 to 500 mm of rain to accumulate about the ranges south of Little Wanganui, and 150 to 250 mm elsewhere. Peak rates of 10 to 15 mm/h about the ranges.

 

Area: Westland

Period: 65hrs from 1am Tue, 16 Aug – 6pm Thu, 18 Aug

Forecast: Periods of heavy rain. Expect 350 to 550 mm of rain to accumulate about the ranges, especially between Bruce Bay and Otira, and 150 to 250 mm about the coast. Peak rates of 10 to 20 mm/h about the ranges.

Weather Warnings

https://www.metservice.com/warnings/home

 

Strong Wind Warning

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

Area: The Canterbury Plains, Christchurch and Banks Peninsula

Period: 17hrs from 2pm Fri, 5 Aug – 7am Sat, 6 Aug

Forecast: Northwest gales are forecast to be severe at times, with gusts of 120 km/h in exposed places. Note that the strongest winds are expected about Banks Peninsula and near the foothills.

 

Area: Fiordland, Southland, Stewart Island and Otago

Period: 15hrs from 8am – 11pm Fri, 5 Aug

Forecast: Northwest gales are forecast to be severe at times, with gusts reaching 130 km/h in exposed places.

 

Area: Canterbury High Country

Period: 22hrs from 9am Fri, 5 Aug – 7am Sat, 6 Aug

Forecast: Northwest gales are forecast to be severe at times, with damaging gusts of 140 to 160 km/h in exposed places.

Severe Weather Warnings

Heavy Rain Warning – Orange

Impact: 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 north of Otira and Buller

Period: 14hrs from 5am – 7pm Sat, 6 Aug

Forecast: Expect a period of heavy rain. 70 to 100 mm of rain to accumulate in the ranges during this period. Peak rates of 10 to 20 mm/h.

 

Area: Westland about and south of Otira

Period: 23hrs from 2pm Fri, 5 Aug – 1pm Sat, 6 Aug

Forecast: Expect 180 to 280 mm of rain about the ranges, and 60 to 90 mm about the coast. Peak rates of 20 to 30 mm/h about the ranges overnight Friday and Saturday morning.

 

Area: The headwaters of the Canterbury lakes and rivers about and south of Arthur’s Pass

Period: 19hrs from 6pm Fri, 5 Aug – 1pm Sat, 6 Aug

Forecast: Expect 180 to 240 mm of rain about the main divide, and 70 to 130 mm within 25 km east of the divide. Peak rates of 15 to 25 mm/h about the divide. Note that significant snow melt is likely to occur. Freezing level around 2400 metres.

 

Area: The headwaters of the Otago lakes and rivers

Period: 15hrs from 3pm Fri, 5 Aug – 6am Sat, 6 Aug

Forecast: Expect 140 to 200 mm of rain about the main divide, and 70 to 120 mm within 25 km east of the divide. Peak rates of 15 to 25 mm/h expected about the divide. Note that significant snow melt is likely to occur. Freezing level around 2300 metres.

 

Area: Fiordland

Period: 15hrs from 11am Fri, 5 Aug – 2am Sat, 6 Aug

Forecast: Expect 100 to 150 mm of rain to accumulate during this period. Peak rates of 15 to 25 mm/h.

Heavy Snow Warning

Road Snowfall Warning

Period:

4hrs from 10am – 2pm Tue, 26 Jul

Area:

Porters Pass (SH73)

Forecast:

Light snow about the summit of the road until early afternoon (Tuesday), a further 1cm or less may accumulate about the summit.

Heavy Rain Warning

Heavy Rain Warning – Orange

Period:

20hrs from 8am Tue, 26 Jul – 4am Wed, 27 Jul

Area:

Canterbury south of the Rakaia River

Forecast:

Periods of heavy rain. In addition to the 40 to 55 mm of rain which has already accumulated expect a further 80 to 100 mm to accumulate. Peak rates of 10 to 15 mm per hour. Freezing level about 1600 metres.

Impact:

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

Heavy Rain Watch/Warning

  • Heavy Rain Warning – Orange

    Period:

    4hrs from 8am – noon Tue, 26 Jul

    Area:

    Tasman about and west of Motueka

    Forecast:

    Periods of heavy rain. Expect a further 15 to 25 mm of rain to accumulate this morning, on top of the 80 to 100 mm that has already accumulated. Note, that periods of rain or showers are expected to continue to Wednesday evening.

    Impact:

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

    Issued: 8:22am Tue 26 JulNext update: 10:00pm Tue 26 Jul

Heavy Rain Watch

  • Heavy Rain Watch

    Period:

    15hrs from 11pm Tue, 26 Jul – 2pm Wed, 27 Jul

    Area:

    About Mount Ruapehu

    Forecast:

    Periods of heavy rain. Rainfall amounts may approach warning criteria.

    Issued: 8:22am Tue 26 JulNext update: 10:00pm Tue 26 Jul

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