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#1428509 - 20/07/2017 15:25 Re: New Zealand Weather [Re: Willoughby]
pete28 Offline
Weatherzone Addict

Registered: 08/01/2007
Posts: 1131
Loc: Christchurch, New Zealand
Another week another severe storm - this one with a central pressure of 968hpa over Christchurch tomorrow afternoon! Places like Dunedin and Timaru could receive between 120-160mm in a 12 hour period along with severe gales and over a metre of snow above 700m. This one is a doozy...


SEVERE WEATHER WARNING.

ISSUED BY MetService AT 11:44 am 20-Jul-2017
Heavy rain for Bay of Plenty, Canterbury and eastern Otago. Also, strong winds for Auckland, Bay of Plenty and Gisborne.
NOTE: THIS IS AN UPDATE TO INCREASE THE RAINFALL AMOUNTS FOR SOUTH CANTERBURY, NORTH OTAGO AND DUNEDIN.

A large complex low pressure system is expected to move over the country today and slowly move east during Friday and Saturday. An associated front crosses the North Island, bringing a period of severe gale northeasterlies and a burst of heavy rain to northern parts of the Island. The strongest winds are expected in Bay of Plenty and Gisborne where northeast gusts could reach 120 km/h in exposed places. Heavy rain is expected in Bay of Plenty and Rotorua from this afternoon to overnight tonight, and 100mm of rain could accumulate in 12 hours.

Rain is also expected to become heavy over eastern districts of the South Island during Friday and continue into Saturday as the complex low pressure system moves east. The heaviest falls are expected in Canterbury south of the Rakaia River and eastern Otago where up to 200mm of rain could accumulate, with snow lowering to 800 metres about the Canterbury High Country and 600 metres in Otago during Friday evening.

This is a significant weather event and the combination of heavy rain and strong winds is expected to cause widespread disruption to transport, localised flooding and slips. Winds of this strength can cause damage to trees, powerlines, unsecured roofs and structures, and make driving hazardous. Also in the South Island, wind chill due to cold temperatures and strong winds could cause stress to livestock.

Note, large south to southeast waves may cause coastal inundation along south Canterbury and Otago coasts during Friday and Saturday.

HEAVY RAIN WARNING
AREA/S AFFECTED
Bay of Plenty and Rotorua
FORECAST
Rain is expected to become heavy this afternoon, and ease overnight tonight.

In the 12 hours from 2pm this afternoon to 2am Friday morning, expect 90 to 100mm of rain to accumulate. Peak intensities of 20 to 30mm per hour.

AREA/S AFFECTED
Canterbury north of the Rakaia River
FORECAST
Rain is expected to become heavy Friday morning and ease overnight Friday.

In the 20 hour period from 6am Friday to 2am Saturday, expect 120 to 160mm of rain about the Foothills and ranges and 80 to 100mm towards the coast. Peak intensities of 15 to 20mm per hour. However, above 800 metres, rain turns to snow from Friday evening.

FREEZING LEVEL: About 2000 metres, lowering to 1100 metres Friday evening.

AREA/S AFFECTED
Canterbury south of the Rakaia River and North Otago
FORECAST
Rain is expected to become heavy Friday morning and ease during Saturday morning.

In the 25 hour period from 7am Friday to 8am Saturday, expect 150 to 200mm of rain to accumulate. Peak intensities of 15 to 20mm per hour.

FREEZING LEVEL: About 2000 metres, lowering to 1100 metres Friday evening.

AREA/S AFFECTED
Dunedin
FORECAST
Rain is expected to become heavy around midday Friday and ease early Saturday morning.

In the 18 hour period from midday Friday to 6am Saturday, expect 150 to 200mm of rain to accumulate. Peak intesities of 15 to 20mm per hour.

FREEZING LEVEL: About 2000 metres, lowering to 1000 metres Friday evening.

STRONG WIND WARNING
AREA/S AFFECTED
Auckland and Great Barrier Island
FORECAST
Northeast gales are expected to become severe this (Thursday) afternoon, gusting 100 km/h, then ease this evening.

AREA/S AFFECTED
Bay of Plenty, Rotorua and Gisborne
FORECAST
Northeast gales are expected to become severe this (Thursday) afternoon, gusting 120 km/h in exposed places, easing overnight tonight.

NEXT SEVERE WEATHER WARNING WILL BE ISSUED AT OR BEFORE 9:00 pm Thursday 20-Jul-2017

Funded by NZ Government

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#1428606 - 21/07/2017 20:39 Re: New Zealand Weather [Re: Willoughby]
Homer Offline
Meteorological Motor Mouth

Registered: 16/06/2007
Posts: 5920
Loc: Dural
Geez.
I've been reading reports from over there this afternoon and this is one serious system!!

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#1428694 - 23/07/2017 10:00 Re: New Zealand Weather [Re: Willoughby]
Homer Offline
Meteorological Motor Mouth

Registered: 16/06/2007
Posts: 5920
Loc: Dural
Holy cow!!!
Some of the pictures in the (weather section) New Zealand thread on ski.com are incredible!!

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#1453534 - 20/02/2018 10:20 Re: New Zealand Weather [Re: Willoughby]
pete28 Offline
Weatherzone Addict

Registered: 08/01/2007
Posts: 1131
Loc: Christchurch, New Zealand
Some extreme weather today and tomorrow for the lower North Island and the top half of the South Island with the passing of ex TC Gita, will be some major flood and storm surge issues by this time tomorrow morning:

Cyclone Gita, currently located over the Tasman Sea, is forecast to track southeastwards and cross central New Zealand late today and early Wednesday.

Note that the Watches for heavy rain for Christchurch, the Banks Peninsula and North Otago have been upgraded to full Warnings.

The passage of Gita is expected to bring a period of high-impact severe weather to central New Zealand. Heavy rain will cause slips, rapidly rising streams and rivers, and flooding. Severe gales with damaging gusts are expected, so people are advised to secure property and items that may be blown away by strong winds. There is also the potential for coastal inundation with high tide overnight Tuesday and before dawn on Wednesday, due to the combination of tides, low air-pressure, strong onshore winds and large waves in excess of 6 metres in some places. For the North Island, coastal areas from Raglan southwards to southern Wairarapa are most at risk. For the South Island, the risk of coastal inundation is greatest for areas from Buller and North Canterbury northwards.

People are advised to keep up to date with the latest forecasts. Please see http://www.metservice.com/warnings/tropical-cyclone-activity for more detail on Cyclone Gita, including the latest track map.

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: Nelson and Buller
Valid: 10 hours from 11:00am to 9:00pm Tuesday
Forecast: In addition to rain that has already accumulated expect a further 100 to 150mm of rain to in Nelson west of Motueka, and 70 to 100mm elsewhere. Peak intensities of 20 to 30mm/hr possible.

Area: Marlborough including the Kaikoura Coast
Valid: 11 hours from 11:00am to 10:00pm Tuesday
Forecast: In addition to rain that has already accumulated expect a further 100 to 150mm of rain about higher ground, and 70 to 120mm elsewhere. Peak intensities of 20 to 30mm/hr possible.

Area: Wellington and Kapiti Coast
Valid: 3 hours from 11:00am to 2:00pm Tuesday
Forecast: Expect a further 30 to 40mm in addition to the rain that has already accumulated. Peak intensities 10 to 15mm per hour. Further lighter rain is expected for the remainder of today.

Area: Canterbury including Christchurch and the Banks Peninsula. The ranges of Westland.
Valid: 24 hours from 11:00am Tuesday to 11:00am Wednesday
Forecast: In addition to rain that has already accumulated expect a further 90 to 150mm of rain to accumulate during this period about Canterbury High Country, and 70 to 100mm elsewhere. Peak intensities of 20 to 30mm/hr possible about Canterbury High Country.

Area: North Otago.
Valid: 22 hours from 1:00pm Tuesday to 11:00am Wednesday
Forecast: Expect 60 to 90mm of rain to accumulate. Peak intensities of 10 to 15mm/hr.

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: Taranaki, Taihape, Whanganui
Valid: 10 hours from 3:00pm Tuesday to 1:00am Wednesday
Forecast: Severe gale north to northwest winds gusting 120 km/h in exposed parts of North Taranaki, but damaging gusts of 140 km/h in exposed parts of South Taranaki, Whanganui and Taihape.

Area: Manawatu, Kapiti-Horowhenua, Wellington and Wairarapa including the Tararua District
Valid: 12 hours from 6:00pm Tuesday to 6:00am Wednesday
Forecast: Severe gale north to northwest winds gusting 120 km/h in exposed places, but 140 km/h in Wellington on Tuesday evening.

Area: Nelson and Buller
Valid: 8 hours from 2:00pm to 10:00pm Tuesday
Forecast: Severe gale easterly winds with damaging gusts of 130 to 140 km/h in exposed places. Note that winds are expected to turn northwest severe gale gusting 130 km/h north of Nelson City this evening, easing overnight Tuesday.

Area: Marlborough including the Kaikoura Coast
Valid: 12 hours from 3:00pm Tuesday to 3:00am Wednesday
Forecast: Severe gale southeasterlies gusting 120 km/h or more in exposed places. Turning northwest severe gale gusting 120 km/h about the Marlborough Sounds this evening.

Area: Westland and the Canterbury High Country near the Alps
Valid: 11 hours from 12:00pm to 11:00pm Tuesday
Forecast: Severe gale southeast winds with damaging gusts of 150 km/h possible in exposed places.

Area: Canterbury from Banks Peninsula northwards
Valid: 20 hours from 7:00pm Tuesday to 3:00pm Wednesday
Forecast: Severe south to southeast gales gusting 130 km/h in exposed places. Turning southwest severe gale gusting 120 km/h about the Banks Peninsula Wednesday morning but easing elsewhere. Easing about the Banks Peninsula Wednesday afternoon.

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#1453545 - 20/02/2018 11:01 Re: New Zealand Weather [Re: Willoughby]
Inclement Weather Offline
Meteorological Motor Mouth

Registered: 07/03/2006
Posts: 5228
Loc: Diamond Valley
Wishing all our Kiwi cousins safe shelter from this Tasman tempest. Thanks for posting Pete - wishing you well, mate.
_________________________
The original donut hole

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#1453554 - 20/02/2018 11:49 Re: New Zealand Weather [Re: Inclement Weather]
pete28 Offline
Weatherzone Addict

Registered: 08/01/2007
Posts: 1131
Loc: Christchurch, New Zealand
Originally Posted By: Inclement Weather
Wishing all our Kiwi cousins safe shelter from this Tasman tempest. Thanks for posting Pete - wishing you well, mate.


Thanks mate, already some surface flooding around Christchurch and the worst of the rain hasn't arrived yet, also Mount Hutt is forecast to receive 1.2m of snow by tomorrow, not bad for February!!

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#1453591 - 20/02/2018 17:20 Re: New Zealand Weather [Re: Willoughby]
Knot Offline
Weatherzone Addict

Registered: 01/05/2014
Posts: 2560
Loc: Toronto N.S.W
Goodluck Pete. I was keeping tabs on Gita till it started tracking SE. I think the bullseye is further south in NZ than first thought. Wellington I think it was. Can't be entirely precise with these things I guess. Wow what a dump at Mt Hutt
_________________________
If you can't change something, there is only one option. Adapt!

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#1453636 - 20/02/2018 21:04 Re: New Zealand Weather [Re: Inclement Weather]
cold@28 Offline
Weatherzone Addict

Registered: 07/02/2011
Posts: 2458
Loc: Chillagoe
Originally Posted By: Inclement Weather
Wishing all our Kiwi cousins safe shelter from this Tasman tempest. Thanks for posting Pete - wishing you well, mate.


Ditto from me too. She's still a Cat 1 isn't she, til landfall?

Originally Posted By: Homer
Holy cow!!!
Some of the pictures in the (weather section) New Zealand thread on ski.com are incredible!!


Have you a link please? Tried to find my way around to no avail.


Edited by cold@28 (20/02/2018 21:08)

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#1453713 - 21/02/2018 11:38 Re: New Zealand Weather [Re: Willoughby]
Knot Offline
Weatherzone Addict

Registered: 01/05/2014
Posts: 2560
Loc: Toronto N.S.W
Amazing seeing two intense low pressure air masses on either side of the South Island per nullschool.
_________________________
If you can't change something, there is only one option. Adapt!

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#1461151 - 07/04/2018 14:35 Re: New Zealand Weather [Re: Willoughby]
pete28 Offline
Weatherzone Addict

Registered: 08/01/2007
Posts: 1131
Loc: Christchurch, New Zealand
First really good cold snap heading New Zealandís way on Tuesday and Wednesday with heavy snow above 400m for Canterbury and 500m for Otago. For early April this is a little unusual but not unheard of.


On Monday, a deepening low is expected to be approaching central New Zealand from the Tasman Sea. Meanwhile a cold front should move up the South Island during the day. The low is expected to cross over the North Island during Tuesday, allowing strong cold southerlies to spread over the entire country.

The combination of these features is expected to bring strong to gale force winds, heavy rain and thunderstorms to many places over first half of next week. Significant snowfalls are likely about the higher ground of both Islands, with lesser amounts down to around 400 metres in the South Island and 700 metres in the North Island.

During Monday and Tuesday there is low confidence that snowfalls above 500 metres in Southland and Otago will be enough to warrant a warning. On Tuesday and Wednesday there is moderate confidence that snowfall accumulations above 400 metres in Canterbury, Marlborough and Nelson will need a warning. About Tongariro National Park there is low confidence that a warning for heavy snow above 900 metres will be needed on Wednesday.

There is low confidence that heavy rain about Buller, Nelson, the Marlborough Sounds,and the North Island from southern Waikato to Kapiti, including Taupo and Taihape on Tuesday will be enough for a warning.

During Tuesday and Wednesday, severe southwest to southeast gales could affect most of the North Island and eastern areas of the South Island. Currently there is moderate confidence that a warning will be required for northern Marlborough and all North Island areas except Gisborne, Hawkes Bay and the Tararua District. There is low confidence that a wind warning will be needed for the eastern South Island during Tuesday and Wednesday and for Gisborne, Hawkes Bay and Tararua district on Wednesday and Thursday.

Also, large southerly waves are forecast to affect southern and eastern coasts of both Islands on Tuesday and Wednesday, while large southwesterly waves may affect the west coast of the North Island from Taranaki northwards on Wednesday.

During Wednesday a narrow ridge should move onto the South Island, easing weather conditions there. The ridge moves towards the North Island on Thursday while another low approaches the South Island bringing rain to the west of the Island. There is low confidence that warning amounts of rain will fall in Fiordland and southern Westland on Thursday.

[img:left]http://[/img]

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#1461362 - 10/04/2018 11:46 Re: New Zealand Weather [Re: Willoughby]
RichieM Offline
Weather Freak

Registered: 24/08/2015
Posts: 96
Loc: Manunda, Cairns
Quite a few houses destroyed from tornadoes in the North Island today and very low level snow in the South Island for early April.

https://i.stuff.co.nz/national/102964499/live-an-april-storm-hits

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#1463899 - 15/05/2018 20:42 Re: New Zealand Weather [Re: Willoughby]
Mega Offline
Meteorological Motor Mouth

Registered: 03/02/2003
Posts: 7112
Loc: Maryborough, Wide Bay, QLD
Looks very miserable in your neck of the woods for the next 10 days at least - cold, showery and very windy.

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