Convective week 26-Nov to 4-Dec

[NZ Thunderstorm Soc]

Here are some photos I took of today's Mt. Peel thunderstorm.

DSC02263.JPG

[NZ Thunderstorm Soc]

2 more

[Thunder]

I had to go to Ashburton so missed out on the downpours in Mt Somers, I saw it as I was coming back. Heard plenty of thunder when I was back but lightning must've been up in the clouds for the most part.

Great pictures from you John and that time-lapse is great Steven!

Aaron

[NZ Thunderstorm Soc]

I had to go to Ashburton so missed out on the downpours in Mt Somers, I saw it as I was coming back. Heard plenty of thunder when I was back but lightning must've been up in the clouds for the most part.

Great pictures from you John and that time-lapse is great Steven!

Aaron

Thanks.
The majority of the lightning was in the cloud. I never saw any lightning at all but the sferics were crackling away quite nicely on my radio in the truck and the thunder in the cloud was quite continuous.
Would be interesting to see how many internal or non earth strikes were recorded on MS's lightning detector for this storm?

[mikestormchaser]

Nice pictures guys. Richard, John and Steve!! That one sent through to stormchasers looks like a small downburst

[NZstorm]

Nice pics and timelaspse.

Looking like more thundery activity for inland NI again today from mid Waikato southward.

[NZstorm]

7 days precip charts, the model output from gfs last weekend versus Met Service actual rain past 7 days.

Looks like GFS anticipated the event quite well. A simple convective set up though (no capping for example) so the model was able to easily deal with it.

cumulativeRainfallImage.png

[tich]

Might have been an error, but I saw late yesterday on MetService site that Taupo had recorded 60mm in 1 hour!

[David]

Might have been an error, but I saw late yesterday on MetService site that Taupo had recorded 60mm in 1 hour!

Wow! Was able to find this - this weather station at the airport shows 61mm between 7.36pm and 8.36pm
https://www.wunderground.com/personal-w ... 201/mdaily

And this one a bit further north recorded 60mm in 45 minutes
https://www.wunderground.com/personal-w ... 201/mdaily

[NZ Thunderstorm Soc]

If it rained like that in Taupo, how come there wasn't another "Roxburgh Downpour" event?

Anyway, one or 2 Cu going up down here but not like yesterday, or like it was during the week..
Up to 28C here for the day.

[David]

Taupo would be a lot more used to heavy rainfall than a dry area like Roxburgh is. Also it looks like the downpour missed the main Taupo town anyway.

[NZstorm]

Fine day in Auckland and I see a cb is trying to develop to the south. Its very glaciated but struggling at this stage.

Re flash flooding Roxburgh versus Taupo. There are so many factors that go into a flash flood event such as topography, moisture levels in ground..... And as David suggests, Taupo is a high rainfall area and used to downpours whereas Roxburgh is semi arid.

[cbm]

Nasty little flash flood in Cambridge right now . Drains are only just coping.

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[cbm]

Hoping it will stop soon. If not, this is going to cause some houses some problems. Loud thunder overhead too.

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[spwill]

A fine dry day in Auckland as expected, can see the Cbs popping up to the south of the Bombay Hills

GFS is pointing to a fine dry day for Auckland tomorrow, the afternoon showers up Northland way

[tich]

Re flash flooding Roxburgh versus Taupo. There are so many factors that go into a flash flood event such as topography, moisture levels in ground..... And as David suggests, Taupo is a high rainfall area and used to downpours whereas Roxburgh is semi arid.

I believe the soils around Taupo are volcanic pumice, which drains more quickly. I don't think Taupo is an a high rainfall area, being sheltered by mountain ranges around the lake. But probably significantly wetter than Roxburgh.

[Richard]

And the terrain is so different too, quite steep hills around Roxburgh so run off is fast if a heap of rain falls

[Tornado Tim]

Some Thunder again this afternoon with a cell over Cambridge and Hamilton today. Missed most of the rain as the Hamilton cell started developing over Matangi then drifted over Hamilton.
The cold upper level temps we have been having over the past week are now departing from tommorow.
Might get the odd heavy shower with some Thunder tommorow, but convection wont be as vigorous as it has been over the past week.

[treetopkk]

Was good while it lasted,missed all the action in sth island,nwerly so will be hot/dry.