Convective period. 26-28 Nov

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Tornado Tim
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Re: Convective period. 26-28 Nov

Unread post by Tornado Tim »

Outlook and Watch for Today:
Outlook:
Metservice wrote:A complex trough of low pressure will move slowly onto northern and central parts of New Zealand today, bringing the potential for significant localised rainfalls. Conditions are expected to be unstable over much of the North Island and the extreme northwest of the South Island. There is a high risk of scattered thunderstorms over central parts of the North Island this afternoon and evening,with a moderate risk extending up to Northland and a broader low risk down to Wairarapa and coastal Buller, as indicated on the chart. Any thunderstorms that develop are expected to produce localised heavy rain of 15 to 25mm per hour, hail and also brief strong wind gusts up to 80 km/h. There is also a moderate risk that one or two of these thunderstorms could be SEVERE over central areas producing localised downpours of 25 to 40mm per hour and a SEVERE THUNDERSTORM WATCH has been issued.

No thunderstorms or significant convection expected elsewhere.
756c-14292fe2b00-1429447c200-14290d3d182.0.png
Watch:
Metservice wrote:Issued by MetService at 08:19 am Tuesday 26 November 2013
Valid until 10:00 pm Tuesday 26 November 2013
This watch affects people in the following weather forecast districts:
Waikato
Waitomo
Taumarunui
Bay of Plenty
Rotorua
Taupo
Gisborne
Hawkes Bay
Taranaki
Taihape
Wanganui
Manawatu
Tararua

Scattered thunderstorms are expected to develop over central parts of the North Island this afternoon and evening. One or two of these thunderstorms may be SEVERE producing localised downpours of 25 to 40mm per hour. Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips.

Note: A Severe Thunderstorm Watch means conditions are favourable for severe thunderstorms in and close to the watch area. People in these areas should be on the lookout for threatening weather conditions and listen for possible Severe Thunderstorm Warnings.

Issued by: Andy Downs
This watch will be updated by: 02:00 pm Tuesday 26 November 2013
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Re: Convective period. 26-28 Nov

Unread post by spwill »

NZstorm wrote:Last time we had a thunderstorm set up like this was April 21.
.
I think our best storms this year were in May, May is usually good here.

I think there might be a lack of convergence/heating for Auckland today, I will consider a drive south this afternoon.
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Re: Convective period. 26-28 Nov

Unread post by Manukau heads obs »

some blue patches here now after the passage of the warm front
(with a bit of drizzle)
wind is now NNW here
so missing that NE convergence now
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Re: Convective period. 26-28 Nov

Unread post by David »

I see MS has downgraded our risk in Auckland/Northland to moderate. 20C with an 18C dewpoint here but it's cloudy with occasional very light drizzle.
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Re: Convective period. 26-28 Nov

Unread post by Tornado Tim »

Nice dark bases around now, and Sun coming in...... Today and Thursday is the day! :D
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Re: Convective period. 26-28 Nov

Unread post by NZstorm »

Manukau heads obs wrote:some blue patches here now after the passage of the warm front
(with a bit of drizzle)
wind is now NNW here
so missing that NE convergence now
Yes, we need the NE sea breeze to come in. Otherwise its a mainly fine very warm afternoon for Auckland. Temp 24C dp19C currently.

Looks like inland is the place to be today. Taupo!
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Re: Convective period. 26-28 Nov

Unread post by jamie »

showers developing all around me at the moment.

wind has notably increased to a moderate NW.
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Re: Convective period. 26-28 Nov

Unread post by David »

NZstorm wrote: Yes, we need the NE sea breeze to come in. Otherwise its a mainly fine very warm afternoon for Auckland. Temp 24C dp19C currently.
It's been NE in Howick all day
Very humid 24C, DP 20C
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Re: Convective period. 26-28 Nov

Unread post by Tornado Tim »

Things are going to pop soon, humid and warm. 24.8 and rising!
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Re: Convective period. 26-28 Nov

Unread post by jamie »

yes your right Tim. Looks to be 'popping' to my ESE. A line of showers is going up with a nice base and brilliant crispy white tops
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Re: Convective period. 26-28 Nov

Unread post by jamie »

That stuff to my SE is growing nicely and heading towards Rotorua. I was thinking of following it because of how it looked but sadly i wouldn't have been able to follow it to Rotorua any way.
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Re: Convective period. 26-28 Nov

Unread post by David »

Convergence line has started forming from south Auckland down through the Waikato
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Re: Convective period. 26-28 Nov

Unread post by jamie »

David wrote:Convergence line has started forming from south Auckland down through the Waikato
edited.jpg
yea and its just to my east but moving away quite quickly. Great view from here tho.
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Re: Convective period. 26-28 Nov

Unread post by David »

Typical how it cuts off at south Auckland... if only it extended a bit further north it would be pretty close to me.
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Re: Convective period. 26-28 Nov

Unread post by David »

Unfortunately we lost the NE sea breeze about 3.20pm ... but I wonder why nothing fired up before then. We certainly had enough heat and humidity :)
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Re: Convective period. 26-28 Nov

Unread post by spwill »

Drove down to Matamata this afternoon, heavy showers and thunderstorms around these parts.
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Re: Convective period. 26-28 Nov

Unread post by Manukau heads obs »

I did see a brief funnel cloud out of the cloud base over Papakura way at one stage this afternoon
(I was at Big bay at the time, helping out with school camp)
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Re: Convective period. 26-28 Nov

Unread post by Tornado Tim »

Well conditions didnt fire exactly the way I was hoping. Scattered Showers and the odd Thundershower thrown in around Matamata/Piako, East Waikato which was where I hung around this afternoon.
But the air mixed out really badly with scuddy cloud top's, such a pitty :(
Taupo did much better I see :)
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Re: Convective period. 26-28 Nov

Unread post by NZstorm »

Can see the cb tops around Taupo from here and they look like good cb's.
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Re: Convective period. 26-28 Nov

Unread post by NZstorm »

I think we will get thunder in Auckland area tomorrow afternoon/evening. Low level winds will be E which will be conducive to convection in our parts.
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Re: Convective period. 26-28 Nov

Unread post by Manukau heads obs »

yes, inlaws report lots of thunder lake taupo area :)

yes, tomorrow will be our turn I think too :)
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Re: Convective period. 26-28 Nov

Unread post by Orion »

On Trademe, people from Napier & Hastings reporting thunder.
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Re: Convective period. 26-28 Nov

Unread post by Manukau heads obs »

photo of CB cloud that produced a small funell cloud not long after this photo
south auckland area
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Re: Convective period. 26-28 Nov

Unread post by jamie »

Taupo has been the spot to be with these last couple of setups.

We were slightly too far west this time. Missed out today so desperate to catch something in the next two days or we will be looking quite sad with only 46mm this month and only 75mm for October. We need 100mm/month to stay in good condition.
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Re: Convective period. 26-28 Nov

Unread post by spwill »

Nice shot Brian.
My first visit to Hobbiton ( Matamata) this afternoon, a thunderstorm there at 2pm, a lot of heavy showers and a few storms across that area, nothing severe observed but plenty of rain. Storm chasing takes you places you would never normally go :> A few photos from my afternoon.
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