Fronts & T-storms over North Island - Oct 18-20

[bmo]

It's raining....1mm so far in the last 10 minutes.

[spwill]

A big change in dewpoint here this morning, 8C to 15C.

[jamie]

Wow 30mm over night. Was not expecting that. It's turning out to be a wet month

[Manukau heads obs]

steady rain here last evening, 15mm
now 84mm for the month...which is about average...and only just over half way through the month..
but a dry patch coming up...
on track to be a wetter than normal year here (which will be the first time for a while)

[Nev]

21mm here between about 8pm and 4am from last night's front.

T-storm Outlook last night looked good for much of the North Island later today?

[NZstorm]

The cold pool shows up quite well on sat pic.

The upper North will get the main impacts from it tomorrow. Any daytime heating will lift instability levels, coupled with low level convergence, may see isolated heavy thundery falls of small hail. There is a chance somewhere is going to get a decent hail accumulation tomorrow, possibly in the Waikato. There will need to be surface heating though.

[jamie]

steady rain here last evening, 15mm
now 84mm for the month...which is about average...and only just over half way through the month..
but a dry patch coming up...
on track to be a wetter than normal year here (which will be the first time for a while)

im up to 143mm for the month and this year we are heading for a wetter than normal year too which like you said brian is the first in a number of years.

I like the looks of the sat pic this morning. nice juicy stuff coming our way

[spwill]

Back to winter for a day or two with the upper atmosphere really cooling off today, it will be cold under the showers.

Should get higher than 16C this morning, currently 14C.

[jamie]

Making a thread for this. It is more than just general weather.

Things are looking quite unstable for the next couple of days for quite a bit of NZ while the rest of NZ has prolonged heavy rain.

I really like how cold the upper air is going to be and like NZstorm said there could be some good accumulations of hail on Wednesday. The one thing we are going to need though is heating. It looks to me like this will be probably our major limiting factor. But with the upper air being so cold less heating is required i suppose.

[Nev]

Making a thread for this. It is more than just general weather.

Was just about to do the same thing.

Edit:
MS have just issued their 'Severe Thunderstorm Outlook' for Wednesday, which also looks promising.

[Nev]

Had a few brief heavy showers here this morn, but this current one has some 5mm hail.

[Tornado Tim]

Severe Thunderstorm Warning:

77ba-13314acaa60-36ee80-13314bc3ac0.0.png

SEVERE THUNDERSTORM WARNING
TOP PRIORITY FOR IMMEDIATE BROADCAST
Issued by MetService at 02:54 pm Tuesday 18 October 2011.
Valid until 03:37 pm Tuesday 18 October 2011.
This warning affects people in the following local government areas:
MARLBOROUGH.
At 02:37 pm, MetService weather radar detected severe thunderstorms near WARD, SEDDON and THE AWATERE VALLEY.
These severe thunderstorms are moving towards the east, and are expected to lie near WARD, SEDDON and TAYLOR PASS at 03:07 pm and near WARD and SEDDON at 03:37 pm.
These thunderstorms are expected to be accompanied by very heavy rain and large hail.
Very heavy rain can cause surface and/or flash flooding about streams, gullies and urban areas, and make driving conditions extremely hazardous.
Large hail can cause significant damage to crops, orchards, vines, glasshouses and vehicles, and make driving conditions hazardous.
The Ministry of Civil Defence and Emergency Management advises that as storms approach you should:
- Take shelter, preferably indoors away from windows;
- Avoid sheltering under trees, if outside;
- Move cars under cover or away from trees;
- Secure any loose objects around your property;
- Check that drains and gutters are clear;
- Be ready to slow down or stop, if driving.
During and after the storm, you should also:
- Beware of fallen trees and power lines;
- Avoid streams and drains as you may be swept away in flash flooding.
This warning is due to be updated or lifted by 03:37 pm Tuesday 18 October 2011.
NOTE: Only severe thunderstorm tracks are shown in the graphic. Other thunderstorms may exist in the area.

MEDIA PLEASE NOTE: This warning will be updated within the next hour or so. MetService would appreciate it being broadcast regularly during this period.

WWLN nor by Boltek is picking any strikes down that way which is odd, may be just be a very heavy shower with hail.....

[Tornado Tim]

Sat Image looks quite cool atm, with the low center quite visible

[jamie]

Blenheim area having a good run of storms!

Just heard of a good hail shower in Taihape.

[NZ Thunderstorm Soc]

Blenheim area having a good run of storms!

Blenheim is in the South Island though
My sister-in-law has a place near Seddon. Oh, I wish I was there now
JohnGaul
NZThS

[Richard]

Be here John instead John the storms are getting closer.

[jamie]

Blenheim area having a good run of storms!

Blenheim is in the South Island though
My sister-in-law has a place near Seddon. Oh, I wish I was there now
JohnGaul
NZThS

well my excuse is we are watching off North Island Infrastructure (wellington radar) so....

[Tornado Tim]

Odd strikes out by Tauranga atm But they are very weak.

[Razor]

Odd strikes out by Tauranga atm But they are very weak.

Maybe a few could stike the astrolabe reef and start a decent oil blaze

[David]

it will be cold under the showers.

Indeed...there was a heavy shower here for 10 mins around 4pm and the temperature dropped to 11C.

[Michael]

Odd strikes out by Tauranga atm But they are very weak.

Maybe a few could stike the astrolabe reef and start a decent oil blaze

Hopefully they can save some containers,theres the chch family with their house belongings and classic car moving to Aussie.Patties we dont care as theyll be off anyway.

[David]

We seem to be stuck in a line of showers here...third one in the last hour, and the heaviest. 5mm total for the last hr

[bmo]

It's getting colder with each passing shower, its now just 9.8C up to 17.53mm of rain since 12am.

[NZstorm]

Lots of CJ (convective junk) across Auckland this afternoon. There was some small hail in Epsom about 3pm.

[Achten]

Thunder here again in the last hour, spectacular lightning and small hail. Quite unusual for us at this hou,r as most of the storm events I have experienced in the Bay are mid to late afternoon. Not complaining though and it looks promising for tomorrow as well.