Cold outbreak Snow to low levels Wed - Thur 4 - 5 sep

Talbotm · Unread post by **Talbotm** » Sun 01/09/2013 23:01

Looks to be a good system brewing in the southern ocean. At this stage bring snow to low levels. What are your thoughts guys??

NZstorm · Unread post by **NZstorm** » Mon 02/09/2013 07:08

Polar blast goes right up the country with a few cm of snow to 200m over the South Island, 400m lower/central North Island.
There is a chance snow level could be 100m in Dunedin.

shovelopikis · Unread post by **shovelopikis** » Mon 02/09/2013 14:02

Sea level snow possible at times.
looks like a very cold snap, but not much moisture there to produce large accumulations

SPECIAL WEATHER ADVISORY FOR SOUTHLAND, OTAGO, CANTERBURY, MARLBOROUGH, WELLINGTON, WAIRARAPA, TAIHAPE, TAUPO

ISSUED BY METSERVICE AT 11:37am Monday 02-Sep-2013

COLD OUTBREAK ON WEDNESDAY AND THURSDAY

A vigorous cold front is expected to reach the lower South Island by midnight Tuesday, then move rapidly north over the country during Wednesday. During Wednesday and into early Thursday, cold, strong to gale southerlies spread over the country behind this front, with snow to low levels about southern and eastern parts of the South Island and lower North Island. At this stage, significant snow accumulations are expected to be limited to the ranges and higher level roads of both islands. However, people about Southland, Clutha and Dunedin should expect snow to near sea level during Wednesday. From later on Wednesday until early Thursday, snow is expected to fall to about 200 metres in Canterbury north of about the Rakaia River and southern Marlborough, with sleet or bitterly cold rain to near sea level. Over the North Island, temperatures are expected to become significantly colder during Wednesday afternoon and evening, especially about Wellington, Wairarapa and the central plateau, with snow above 400 metres, and southerly gales about and near Cook Strait. Snow is likely to cause disruption to traffic, especially about the higher level roads of both islands. Farmers are advised that the combination of bitterly cold southerlies, rain and snow, is likely to cause stress to vulnerable stock.

NZstorm · Unread post by **NZstorm** » Tue 03/09/2013 07:18

SH1 Desert Road could catch quite a bit of snow late Wednesday into Thursday. Could be 15-20cm.

Looks to be a marginal thunder risk for the west of the North Island tomorrow pm. The last cold event was similar and produced nothing much but this one is at least coming in later in the day when surface heating could contribute. Gisborne also could see isolated thunder/hail.

jamie · Unread post by **jamie** » Tue 03/09/2013 07:23

I'm flying to Palmerston North first thing Thursday so ill have to make sure I'm on the left side of the plane to catch a good view of the central plateau

spwill · Unread post by **spwill** » Tue 03/09/2013 08:29

Works better for thunder here when the upper cold system has more of a Tasman sea track to pick up and pull in moisture.

matttbs · Unread post by **matttbs** » Tue 03/09/2013 11:24

Sever weather watch issued for heavy snow in a lot of places

Bradley · Unread post by **Bradley** » Tue 03/09/2013 14:04

Models are now suggesting up to 10-15cm around the 300m asl, who knows what they will swing back to in tonight's run!!

Classicford · Unread post by **Classicford** » Tue 03/09/2013 16:43

Any interest with this system coming?

Cheers,

Brendon

shovelopikis · Unread post by **shovelopikis** » Tue 03/09/2013 17:09

looks like sea level snow for southland and otago but not huge amounts, just showers

moderate chance of heavy snow for north canterbury and southern malborough , and more of a higher chance with central plateau in the north, but with the fact it will be at a higher settling level of a few hundred msl

looking at the charts, coldest air will be southland/clutha up the eastern coastline untill it hits towards wellington then central plateau
but most moisture will be directed at north cant and NI central high country

then again, could be a hit and miss scenario

so will be interesting to see what we get up here in Hanmer.

NZ Thunderstorm Soc · Tue 03/09/2013 19:58

Pressure to high for interesting development

Needs to be lower.
As I said before interesting to see high pressure moving backwards

shovelopikis · Unread post by **shovelopikis** » Tue 03/09/2013 21:44

NZ Thunderstorm Soc wrote:Pressure to high for interesting development
Needs to be lower.
As I said before interesting to see high pressure moving backwards

which high pressure are you refering to?
it does look like more a quick sharp flick then back to med temps

NZ Thunderstorm Soc · Tue 03/09/2013 21:57

Surface hPa readings??

Orion · Unread post by **Orion** » Wed 04/09/2013 05:59

Southerly arrived about 5am. Rain, rattly at times.
Wind increasing and gusty now.
7.6 degrees.

moylanr · Unread post by **moylanr** » Wed 04/09/2013 06:37

Just started to rain. Temperature ~7C all day so far.

NZstorm · Unread post by **NZstorm** » Wed 04/09/2013 07:05

spwill wrote:Works better for thunder here when the upper cold system has more of a Tasman sea track to pick up and pull in moisture.

Yes, set up looks very marginal, likely only isolated lightning/small hail. Front will bring in some cold rain mid afternoon.

Roll on spring.

snowstormwatcher · Unread post by **snowstormwatcher** » Wed 04/09/2013 07:06

5 degrees here with a strong Southerly but no rain yet.

moylanr · Unread post by **moylanr** » Wed 04/09/2013 07:16

Wind up now. Blown tree onto lines cutting off 176customers towards Lake Ellesmere
How do we get people to trim their vegetation to prevent this every wind storm?

Richard · Unread post by **Richard** » Wed 04/09/2013 07:19

Showers now coming straight up from the south over Southland at the moment,still NW here at the moment but clouds the building much darker.

einzack · Unread post by **einzack** » Wed 04/09/2013 07:26

front hit here 30mins ago. heavy rain mixed in with hail and sleet. a gusty SW came up very quickly.
hail has stopped, but still raining.
hopefully it'll pass as quickly as it came.

spike_01 · Unread post by **spike_01** » Wed 04/09/2013 07:28

Got used to mild temperatures.. Now a cold blast about to arrive around noon - 2pm in Wellington..

einzack · Unread post by **einzack** » Wed 04/09/2013 07:36

and it's now snowing at work. we're 550m asl. rather heavy flakes.

Orion · Unread post by **Orion** » Wed 04/09/2013 08:54

5.6 degrees, gusty wind, rain and 'melting ones' on the window.

jamie · Unread post by **jamie** » Wed 04/09/2013 12:40

looking at the rain radar and it looks like a small low is drifting directly north off the coast of the south islands west coast.

rain has just started here

spwill · Unread post by **spwill** » Wed 04/09/2013 12:42

Currently cloudy 15C here with frontal showers to the southwest, a cooling trend now through the afternoon.

I see the Queenstown cam shows snow has been falling to around 500m, sleet to lake level, very much a wintry scene down there.

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