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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: 1114
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 Online   content
Meteorological Motor Mouth

Registered: 16/06/2007
Posts: 5184
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 Online   content
Meteorological Motor Mouth

Registered: 16/06/2007
Posts: 5184
Loc: Dural
Holy cow!!!
Some of the pictures in the (weather section) New Zealand thread on ski.com are incredible!!

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