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Weather Warnings

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Heavy rain and severe gales for many parts of New Zealand

A deep low and associated fronts move south-southeast across New Zealand today, then away to the east of the South Island on Wednesday. This system delivers heavy rain and severe gales to many parts of the country, and heavy snow to parts of the South Island. Warnings and watches for heavy rain, severe gales and heavy snow are in force in many places.

This is a significant event. People are advised to keep up to date with the latest forecasts in case any changes are made, or more areas added.

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: Coromandel Peninsula

Period: 4hrs from 9am – 1pm Tue, 12 Jul

Forecast: Expect a further 40 to 60 mm of rain to accumulate on top of what has already fallen, especially about the ranges. Peak rates of 15 to 25 mm/h.

Area: Bay of Plenty including Rotorua

Period: 7hrs from 9am – 4pm Tue, 12 Jul

Forecast: Expect a further 50 to 70 mm of rain to accumulate on top of what has already fallen. Peak rates of 15 to 25 mm/h.

Area: Gisborne north of Tolaga Bay

Period: 8hrs from 9am – 5pm Tue, 12 Jul

Forecast: Expect a further 50 to 80 mm of rain to accumulate on the ranges, with lesser amounts about the coast. Peak rates of 20 to 30 mm/h about the ranges from midday.

Area: North Otago, Dunedin

Period: 21hrs from 1pm Tue, 12 Jul – 10am Wed, 13 Jul

Forecast: Expect 70 to 100 mm of rain to accumulate. Peak rates of 10 to 15 mm/h. Note, rain is expected to fall as snow above 300 metres.

Area: Taupo and Taihape

Period: 5hrs from 9am – 2pm Tue, 12 Jul

Forecast: Expect a further 40 to 60 mm of rain to accumulate on top of what has already fallen, especially about the mountains and ranges. Peak rates of 15 to 25 mm/h.

Area: North Taranaki including the mountain

Period: 3hrs from 9am – noon Tue, 12 Jul

Forecast: Expect a further 30 to 60 mm of rain to accumulate about the mountain, with lesser amounts about low lying areas. Peak rates of 15 to 25 mm/h about the mountain.

Area: Tasman

Period: 6hrs from 9am – 3pm Tue, 12 Jul

Forecast: Expect a further 60 to 90 mm of rain to accumulate on top of what has already fallen about and west of Motueka, with lesser amounts elsewhere. Peak rates of 10 to 20 mm/h. Note, another brief burst of heavy rain is possible west of Motueka this evening.

Area: The Tararua Range

Period: 9hrs from 9am – 6pm Tue, 12 Jul

Forecast: Expect a further 60 to 90 mm of rain to accumulate on top of what has already fallen. Peak rates of 15 to 25 mm/h.

Area: Marlborough including Kaikoura Coast

Period: 6hrs from 9am – 3pm Tue, 12 Jul

Forecast: Expect a further 50 to 80 mm of rain to accumulate about the Kaikoura Coast and ranges, with lesser amounts elsewhere. Peak rates of 15 to 25 mm/h about the the Kaikoura Coast and ranges.

Area: Canterbury excluding Christchurch and Banks Peninsula

Period: 15hrs from 9am Tue, 12 Jul – midnight Tue, 12 Jul

Forecast: Expect a further 60 to 90 mm of rain to accumulate below 500 metres on top of what has already fallen. Rain easing north of Christchurch by 6pm and further south by midnight tonight. Peak rates of 10 to 15 mm/h. Heavy snow is expected above 500 metres, see a separate heavy snow warning.

Area: Christchurch including Banks Peninsula

Period: 11hrs from 9am – 8pm Tue, 12 Jul

Forecast: A period of heavy rain. Expect 60 to 90 mm of rain, especially about Banks Peninsula. Peak rates of 10 to 15 mm/h.

Strong Wind Warning – Orange

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

Area: Tasman west of Motueka

Period: 4hrs from 10am – 2pm Tue, 12 Jul

Forecast: East to southeast winds are forecast to rise to severe gale gusting 120 to 130 km/h in exposed places.

Area: Buller

Period: 4hrs from 10am – 2pm Tue, 12 Jul

Forecast: Severe gale east to southeasterlies with gusts of 120 to 130 km/h in exposed places.

Area: Westland about and north of Fox Glacier

Period: 10hrs from 10am – 8pm Tue, 12 Jul

Forecast: Severe gale east to southeasterlies gusting 120 to 130 km/h in exposed places.

 

WARNINGS NO LONGER IN FORCE

Strong Wind Warning – Orange lifted for : Auckland, Great Barrier Island: The threat of winds reaching severe gale has passed and the Warning is lifted.

Heavy Rain Watch lifted for : Northland: The threat of rainfall amounts reaching warning criteria has now passed and the Watch is lifted.

Heavy Rain Watch lifted for : Auckland, Great Barrier Island

Strong Wind Watch lifted for : Northland: The threat of winds reaching severe gale has passed and the Watch is now lifted.

Issued: 10:08am Tue, 12 Jul
Next update: 9pm Tue, 12 Jul

Heavy Rain Watch

Area: Tongariro National Park

Period: 14hrs from 4am – 6pm Fri, 8 Jul

Forecast: A period of heavy rain, accumulations may approach warning amounts.

 

Area: Buller and Westland from Otira northwards.

Period: 35hrs from 4am Fri, 8 Jul – 3pm Sat, 9 Jul

Forecast: Periods of heavy rain. Rainfall amounts may exceed warning criteria, especially about the ranges.

 

Area: Northland

Period: 21hrs from 3pm Thu, 7 Jul – noon Fri, 8 Jul

Forecast: Periods of heavy rain. Rainfall amounts may approach warning criteria, especially in the north and east.

 

Area: Coromandel Peninsula

Period: 15hrs from midnight Thu, 7 Jul – 3pm Fri, 8 Jul

Forecast: Periods of heavy rain. Rainfall amounts may approach warning criteria, especially about the ranges.

 

Area: Rotorua, and Bay of Plenty about and west of Opotiki

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

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

Severe Weather Warnings

Heavy rain for parts of northern and western New Zealand. Heavy snow for higher parts of Otago and South Canterbury. Northerly gales for the central North Island.

A large trough of low pressure is expected to move across New Zealand during Thursday and Friday, bringing strong to gale north to northeast winds, and heavy rain to western and northern parts of both islands. Heavy Rain Watches and Warnings are in force for northern and western parts of the country. A Heavy Snow Watch is in place for the Queenstown Lakes District and a Heavy Snow Warning is in place for the southern part of the Canterbury High Country. A Severe Gale Watch is in place for the central North Island from South Taranaki to Taihape.

This could be a significant weather event, and people are advised to keep up to date with the latest forecasts as some of the Watches are likely to be upgraded to Warnings. Also, more areas will probably be added to the Watch or Warning.

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: Bay of Plenty east of Opotiki, and the ranges of Gisborne north of Ruatoria

Period: 16hrs from 6am – 10pm Fri, 8 Jul

Forecast: Expect 80 to 120mm of rain. Peak intensities of 15 to 20 mm/h Friday afternoon and evening.

 

Area: Mount Taranaki

Period: 13hrs from 1am – 2pm Fri, 8 Jul

Forecast: Expect 80 to 120mm of rain. Peak intensities of 15 to 25 mm/h Friday morning. Note, some heavy showers (or rain) are likely from later Friday afternoon and evening.

 

Area: Tasman west of Motueka

Period: 9hrs from 2am – 11am Fri, 8 Jul

Forecast: A period of heavy rain. Expect 70 to 90mm of rain, peak intensities of 15 to 20 mm/h.

 

Area: The ranges of Westland south of Otira

Period: 34hrs from 5am Fri, 8 Jul – 3pm Sat, 9 Jul

Forecast: Periods of heavy rain. Expect 150 to 230mm of rain, peak intensities of 10 to 20 mm/h. Note, coastal areas may receive 70 to 100mm of rain during this time.

Transpower cautions electricity supply looking tight again this evening

Risk of Power Cuts tonight.
Transpower has called for power companies to increase their generation to reduce the risk of power cuts this evening.
The electricity system operator issued a notice shortly before 4pm advising that there was less than 200 megawatts of slack in the system between 5pm and 7.30pm. Areas affected not advised.   Power Cautions Tonight
Notice issued by Transpower means available supply should still exceed demand, unless something unexpected were to happen.

Severe Weather Warnings

Heavy rain for parts of upper South Island and Northland. Heavy snow for the Canterbury High Country about and north of Rakaia river.

A front brings periods of heavy northerly rain to the upper South Island today, while an east to southeast flow is forecast to bring periods of heavy rain to Northland tomorrow. Rainfall accumulation in these areas may approach warning amounts, and Heavy Rain Watches are in force. The front is also expected to bring heavy snow to Canterbury High Country areas about and north of Rakaia river until early this afternoon and a Heavy Snow Watch remains in force for this area.

People are advised to keep up to date with the latest forecasts in case these watches are upgraded to a warning, or further areas are added.

Heavy Rain Watch

Area: Northland

Period: 13hrs from 5am – 6pm Wed, 29 Jun

Forecast: A period of heavy rain. Rainfall accumulations may approach warning criteria, especially about the eastern areas north of Whangarei.

 

Area: Marlborough Sounds, Rai Valley and Richmond Range

Period: 17hrs from 1pm Tue, 28 Jun – 6am Wed, 29 Jun

Forecast: A period of heavy rain. Rainfall accumulations may approach warning criteria.

 

Area: Westland about and north of Otira and Buller south of Karamea

Period: 6hrs from 9am – 3pm Tue, 28 Jun

Forecast: A period of heavy rain. Rainfall accumulations may approach warning criteria.

Heavy Snow Watch

Area: Canterbury High Country about and north of Rakaia river

Period: 4hrs from 9am – 1pm Tue, 28 Jun

Forecast: A period of snow to 400 metres, with heavy falls above 500 metres where accumulations may approach warning criteria. Note, Heavy Snow Watch south of Rakaia river has now been lifted.

Road Snowfall Warnings

Road Snowfall Warning

Area: Lewis Pass (SH7)

Period: 4hrs from 10am – 2pm Tue, 28 Jun

Forecast: Snow is expected to affect the road until early this afternoon. Expect 4 to 6 cm of snow to accumulate on the road above 700 metres and lesser amounts to 500 metres.

Area: Arthur’s Pass (SH73)

 

Period: 3hrs from 10am – 1pm Tue, 28 Jun

Forecast: A few snow showers are expected to affect the road until early this afternoon. Expect 1 to 2 cm of snow to settle on the road above 700 metres and lesser amounts to 500 metres.

Area: Porters Pass (SH73)

Period: 3hrs from 10am – 1pm Tue, 28 Jun

Forecast: A few snow showers are expected to affect the road until early this afternoon. Expect 1 to 2 cm of snow to settle on the road above 700 metres and lesser amounts to 500 metres.

 

Area: Lindis Pass (SH8)

Period: 3hrs from 10am – 1pm Tue, 28 Jun

Forecast: A few light snow showers may affect the road until early this afternoon, but little if any snow is expected to accumulate.

A weak ridge over New Zealand moves eastwards on Friday as a weak trough approaches the country from the west. A weak cold front is forecast to move northeast over the South Island on Saturday then across the North Island on Sunday, followed by south to southeast winds.

A subtropical low may approach the North Island from the north on Monday, and there is low confidence of southeast winds rising to severe gale in exposed parts of northern and eastern Northland during Monday.

Strong Wind Watch

Area:

Wairarapa north of Featherston, the Tararua District, the ranges of Hawke’s Bay about and south of Te Haroto, and Taihape

Forecast:

Northwest winds may approach severe gale in exposed places.

Severe Thunderstorm Watch

Area: Waitomo, Taranaki, Wanganui, Manawatu, Kapiti-Horowhenua, Wairarapa, Wellington

Period: 5hrs 30min from 9:30am – 3pm Thu, 9 Jun

Forecast: Thunderstorms are expected to affect western parts of the North Island from Waikato southwards until this evening, bringing localised very heavy rain, hail and squally wind gusts.

Between 8am and 2pm Thursday, there is a risk that a few of these thunderstorms could be severe south of Raglan bringing rain with damaging wind gusts in excess of 110 km/h, one or two small or damaging tornadoes.

Wind gusts of this strength can cause some structural damage, including to trees and power lines, and may make driving hazardous.

If any tornadoes occur, they will only affect very localised areas.

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