Unstable Cold Trough April 5th-6th

Storm Struck · Unread post by **Storm Struck** » Fri 05/04/2013 15:48

Just thought i would create a new topic as this was reasonably eventful here and for other parts of the region, much easier to find for future reference etc.
Ive included tomorrow for the risk that covers parts of the North Island, Perhaps one of the admins could shift some of the posts into here

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Anyway the TCU line which developed overhead slowly shifted Northwards and as soon as there was hail stones falling with big rain drops i could see it was about to get active.
A reasonable amount of lightning seen not overly active as i expected more typical of wintry stuff with just 2-3 flashes every 5-6 minutes, but i managed to the get one lightning shot as per below.
I had the Trigger setting on low and i was also semi focused on the beam of the house as you will see, so next time i will be aware of that although i will hopefully be chasing in the open.
2.8mm from that with the majority of the storm hitting around Woodend northwards to Amberley.
I may get some of my footage up later on i will see what its like, but for now this is what i got.

Southerly hasnt hit yet but wont be far off by the looks.

IMG_1972 (800x533).jpg

SSCN2911.JPG

Razor · Unread post by **Razor** » Fri 05/04/2013 15:50

Ahem- you mean April....

No action whatsoever here in Riccarton.

snowstormwatcher · Unread post by **snowstormwatcher** » Fri 05/04/2013 16:11

Some good cloud build ups over ranges SW of Nelson at the moment.

mikestormchaser · Unread post by **mikestormchaser** » Fri 05/04/2013 16:24

Nice pics jase

yep good convergance zone here in Canterbury today, no NW at all witch was good for a change, some sunny periods to made for good heating with the cold air aloft.
i saw alot of "castalanus" this morning to john

incase u missed it

NZ Thunderstorm Soc · Fri 05/04/2013 16:34

mikestormchaser wrote:i saw alot of "castalanus" this morning to john incase u missed it

Nice one

Seemed to of quelled now as no more sfericals for a while.
Must of been a good upper trough because this is highest barometer storm I've noticed in a while here in Cantie

Still nothing much here, ie rain hail etc.

spwill · Unread post by **spwill** » Fri 05/04/2013 16:48

Well done Jason.

tich · Unread post by **tich** » Fri 05/04/2013 17:16

Enough rain earlier in afternoon to wet the ground in St Albans, but nothing since.
Fresh coating of snow on Mt Hutt according to webcam.

Richard · Unread post by **Richard** » Fri 05/04/2013 17:56

Started to pour down here now,no thunder&lightning though.
Hey well done Jason managing get that photo

03Stormchaser · Unread post by **03Stormchaser** » Fri 05/04/2013 20:21

Reports of lightning out east from Auckland. Anyone seeing it?

jamie · Unread post by **jamie** » Fri 05/04/2013 20:37

Yep was just outside and saw a flash to my north east.

Tornado Tim · Unread post by **Tornado Tim** » Fri 05/04/2013 20:51

The trough to the east of Auckland has certainly come alive

Auckland Radar getting echoes up to 60dbz atm, weak CG lightning strikes being picked up too by Blitzortung.

spwill · Unread post by **spwill** » Fri 05/04/2013 21:01

I will take a look east for lightning, could see big towering Cu building east of Ak just before dark

NZstorm · Unread post by **NZstorm** » Sat 06/04/2013 06:51

The energy with the upper trough is crossing us this morning and moving away in the afternoon. It comes through 6 hours too early with regards afternoon convection! However the upper air is still cold this afternoon so maybe isolated convection/shower. Was interesting to see the nice t/cu yesterday in the warm autumn sunshine.

spwill · Unread post by **spwill** » Sat 06/04/2013 07:42

A cool morning after a clear calm night, the heavy shower line coming off the warm sea on our west coast is weakening over the cool land,a Winter like situation. Light rain arriving here, feels cold at 10C after recent weather.

NZstorm · Unread post by **NZstorm** » Sat 06/04/2013 08:14

Grey Lynn on 11C with 0.2mm last hour.

The SST are 21C so good for convection offshore.

David · Unread post by **David** » Sat 06/04/2013 08:18

spwill wrote:A cool morning after a clear calm night, the heavy shower line coming off the warm sea on our west coast is weakening over the cool land,a Winter like situation. Light rain arriving here, feels cold at 10C after recent weather.

Sure does. Down to 9.7C here overnight which is the coldest since 6th Feb. Duvet was required

spwill · Unread post by **spwill** » Sat 06/04/2013 08:21

Heat pump on here

NZstorm wrote:
The SST are 21C so good for convection offshore.

Can see strong cumulus towers going up on the east side of the Coromandel over the warm sea on a convergence line , waterspouts over there today I reckon

snowstormwatcher · Unread post by **snowstormwatcher** » Sat 06/04/2013 08:28

Snow on the higher mountains around Nelson this morning, Some heavy showers with the odd flash of lightning overnight but only 1.5mm of rain in the gauge.

Richard · Unread post by **Richard** » Sat 06/04/2013 08:51

Yes a bit of snow high up around here too,a handy 13mm tipped out just before

jamie · Unread post by **jamie** » Sat 06/04/2013 08:56

Steady cold rain falling at the moment. Very peacefull sound on the roof. It's hitting the southern side of the house which is the first time I've seen since I moved in here back in early October.

Manukau heads obs · Sat 06/04/2013 09:06

Nice surprise to have this upper level rain band move
Over

Tornado Tim · Unread post by **Tornado Tim** » Sat 06/04/2013 10:28

Fairly cool this morning, hovering around 11°C with cool rain at times.
Clearance should come early to mid afternoon with a risk of isolated showers if SFC temps rise considerably.

melja · Unread post by **melja** » Sat 06/04/2013 10:52

Good coating of snow on the hills in the porters pass area going by the castle hill web cam.

Tornado Tim · Unread post by **Tornado Tim** » Sat 06/04/2013 19:26

An Isolated elevated CB developed late afternoon/early evening in north Waikato (non lightning active). Some high based mid topped convection dropping some precip this evening as well.

NZ Thunderstorm Soc · Sat 06/04/2013 19:42

A cloudy day here but there was some remnants of yesterday's instability in the cloud forms especially later this afternoon with a spectacular CU congetsus line to the SE of here, which of course dissipating later.

Nice photos there, Tim. cloud forms looked similar to down here but no precip from them.

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