Thunderstorms possible North Island 8 October

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Re: Thunderstorms possible North Island 8 October

Unread post by 03Stormchaser »

Manukau heads obs wrote:good idea
because once you have downburst tinted glasses on, its hard to be be pursuaded otherwise...
Mind you some may think I have tornado tinted glasses on... :P
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Re: Thunderstorms possible North Island 8 October

Unread post by Manukau heads obs »

same could be said about me :)
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Re: Thunderstorms possible North Island 8 October

Unread post by bobbymcd »

My thinking is that we all agree it was wind-damage associated with a cloud-- a Cb.

As to whether the the cause was within the updraft (as a tornado) or on the updraft/downdraft interface (as a surface eddy or terrain enhanced whirlwind), or within the downdraft (as a down burst) seems to be to be a exercise of academic extravagance for the pendant and purist, unless it is being conducted by an Insurance agent attempting to find a loophole to prevent a payout.

The squall line responsible arrived in Fiji on Tonga on Thursday night . It reached them as fast as an express train, with NW winds rising to 30 gut 40 knots during half an hour, then spinning to a southerly 35 gusting 50 to 60 knots within five minutes that lasted for around half an hour and then followed by a long lull and a few lesser squalls. No reports of Tornadoes in Fiji and Tonga but plenty of "gust damage'.
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Re: Thunderstorms possible North Island 8 October

Unread post by Tornado Tim »

bobbymcd wrote:My thinking is that we all agree it was wind-damage associated with a cloud-- a Cb.

As to whether the the cause was within the updraft (as a tornado) or on the updraft/downdraft interface (as a surface eddy or terrain enhanced whirlwind), or within the downdraft (as a down burst) seems to be to be a exercise of academic extravagance for the pendant and purist, unless it is being conducted by an Insurance agent attempting to find a loophole to prevent a payout.

The squall line responsible arrived in Fiji on Tonga on Thursday night . It reached them as fast as an express train, with NW winds rising to 30 gut 40 knots during half an hour, then spinning to a southerly 35 gusting 50 to 60 knots within five minutes that lasted for around half an hour and then followed by a long lull and a few lesser squalls. No reports of Tornadoes in Fiji and Tonga but plenty of "gust damage'.
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Re: Thunderstorms possible North Island 8 October

Unread post by Manukau heads obs »

yes, welcome along Bob :)
or on the updraft/downdraft interface (as a surface eddy or terrain enhanced whirlwind), or within the downdraft (as a down burst)
yes, I can see that sort of thing occuring....and does...but to my thinking that is normaly short lived...not 2km long path..and also not such a narrow and straight line path either
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Re: Thunderstorms possible North Island 8 October

Unread post by Richard »

Wow :D we have weather royalty among us,welcome Bob :wave:
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Re: Thunderstorms possible North Island 8 October

Unread post by tgsnoopy »

Welcome Bob :)
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Re: Thunderstorms possible North Island 8 October

Unread post by bobbymcd »

Hi all,
yep I'm willing to occasionally add my ideas to the forum- all in the pursuit of the fun of sharing enthusiasm for 'the elements'.

bob
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Re: Thunderstorms possible North Island 8 October

Unread post by NZstorm »

Hi Bob.
As to whether the the cause was within the updraft
Typically a landspout
or on the updraft/downdraft interface
A tornado.
within the downdraft
Squalls can produce gustnadoes.

The house that lost its roof had been refurbished in 2008, which points to F1 strength winds in that spot. A person who lives in that street reckons he saw a tornado come in and it was bouncing with debris spinning up. He was sure it was a tornado and not a squall.
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Re: Thunderstorms possible North Island 8 October

Unread post by Manukau heads obs »

the issue I have with a gustnado is they would tend to cause damage over a wider path I would have thought
or at least more of a lessening trend of damage away from the center of the worst damage, either side
sort of thing

rather than a narrow (only) path of damage which occured
(most noticeable in Ben's video of the tree/fence damage)
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Re: Thunderstorms possible North Island 8 October

Unread post by ben g »

My mate also saw it on the golf course, he saw it spinning,. I'm convinced it was a small tornado from the damage I saw. i just happend to bump into the scene about ten mins after, while heading to my dads for tea and before much stuff had been moved around. Welcome bob we are all weather purists here :)
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Re: Thunderstorms possible North Island 8 October

Unread post by Weather Watcher »

ben g wrote:My mate also saw it on the golf course, he saw it spinning,. I'm convinced it was a small tornado from the damage I saw. i just happend to bump into the scene about ten mins after, while heading to my dads for tea and before much stuff had been moved around. Welcome bob we are all weather purists here :)
Hi Ben G. Really nice photos. What's your best estimate of the time this event occured?
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Re: Thunderstorms possible North Island 8 October

Unread post by spwill »

Weather Watcher wrote:
ben g wrote: Hi Ben G. Really nice photos. What's your best estimate of the time this event occured?
Hi Weather Watcher, do Metservice ever do damage surveys in such events ?
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Re: Thunderstorms possible North Island 8 October

Unread post by Weather Watcher »

We have done a few in the past, but not as many as I think we should. The Waikanae microburst in July 2011 was one that was that was investigated. I believe NIWA have done some of the Taranaki tornadoes.
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Re: Thunderstorms possible North Island 8 October

Unread post by Manukau heads obs »

Hi
Did Ben ever get to you the timing of the event?
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Re: Thunderstorms possible North Island 8 October

Unread post by Weather Watcher »

Manukau heads obs wrote:Hi
Did Ben ever get to you the timing of the event?
Not yet. I'd like to know the time so I can compare it with the correct radar imagery.
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Thunderstorms possible North Island 8 October

Unread post by ben g »

Sorry no, not exactly sure of the time, we did have a power flicker that I assume was the Tin hitting the lines but I did not take note at the time and it is becoming murky in memory now. Around 6.15-630.
Interesting pic from the paper, the other half of the missing roof.
ImageUploadedByTapatalk1382072227.477699.jpg
How far it flew with out hitting anything
ImageUploadedByTapatalk1382072412.136810.jpg
Sorry for the late reply I have a bad habit of not checking in when the big highs move in.
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Re: Thunderstorms possible North Island 8 October

Unread post by Nev »

Appreciate the great reports and images Ben. :D _b

Most media reports say the event occurred either, just after 6pm, 6:15pm or 6:20pm.

Interesting that the power-cut to about 600 homes was reported to have been caused by a Chorus telephone pole being 'knocked' onto power lines on the corner of Tainui and Vauxhall Rds (in front of the shops). That looks to be over 60m NE of the house that lost its roof in Sinclair St. :-k
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Re: Thunderstorms possible North Island 8 October

Unread post by ben g »

The pole that came down was on the corner of Sinclair st and vauxhall. I suspect the tin on the main lines may have had a bit to do with the power cuts. I will find those pics and explain them better
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Re: Thunderstorms possible North Island 8 October

Unread post by Weather Watcher »

Thanks for the times.
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Re: Thunderstorms possible North Island 8 October

Unread post by Nev »

Thanks Ben. Sounds like the initial pole location report must've been an error. :-)
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Re: Thunderstorms possible North Island 8 October

Unread post by spwill »

Great reports by ben g for this storm event.
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Thunderstorms possible North Island 8 October

Unread post by ben g »

Edit
Last edited by ben g on Sat 19/10/2013 10:05, edited 1 time in total.
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Thunderstorms possible North Island 8 October

Unread post by ben g »

Right place at right time!
Here's the offending power pole snapped off at base, but it looks like wires in the conduit going to the ground have put a stop to its travels, photo taken from about half way between Albert rd and Sinclair st, the fire engine is parked in Albert rd
Looking south
ImageUploadedByTapatalk1382130077.337652.jpg
Looking southeast
ImageUploadedByTapatalk1382130114.796850.jpg
Looking south east, from corner sinclair st and vauxhall. the tin on the lines has ended up well to the left hand side of the narrow debris line
ImageUploadedByTapatalk1382130178.238858.jpg
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Thunderstorms possible North Island 8 October

Unread post by ben g »

Fire dispatch times narrow it down a bit,
ImageUploadedByTapatalk1382130957.769968.jpg
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