Canterbury Thunderstorms - 14th December 2009

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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by NZstorm »

I think on the day there was two zones of convergence, the typical northeasterly vs westerly running down the length of Canterbury with a SE change coming up. I think the junction of these two zones of convergence would have been an area of enhanced lift and I reckon this is where the largest hail and also the Methven tornado occured. The model guidance for this event was excellent.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by Weather Watcher »

Radar imagery shows the Methven tornado was around 4pm.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by Nev »

Cool, _b thanks Weather Watcher.

Here's a link to MetVUW's 4pm Chch radar-image (and google-map of Methven).
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by Thunder »

4pm, hmm. Cool. Man we could've made that, we left Hororata at around 3pm initially to then go through the Rakaia Gorge towards Methven way to catch up with the second line we could see way in the distance (confirmed on steve's cellphone when we looked at the radar (through this forum) the line would've been just north of the Rangitata river at this point). Then we got the news from Ben saying of the funnel in springfield so we turned back. Dammit! lol, Oh well.... Considering this information perhaps even if we had laptops and all the mobile data in the world we would've still gone back towards sheffield way, maybe better understanding of likely tornado producing areas is key. For e.g. that second line that produced the gust front was the line that produced the tornado a bit earlier, so as NZstorm says it would've been the combination of varying winds that helped whereas the first cell we were on it was blowing NE even after it passed through. No doubt some form of convergence but not the main kicker.

Soo to get tornadoes the line or cloud your sitting under really has to be the one with the change backing it up, not the pre frontal storms while potentially they may deliever funnels they probably won't produce anything dramatic. That was the case with the 27th October 2002 storm in Tai Tapu I'm pretty sure aswell anyway, it went southerly fairly quickly behind that particular cloud.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by 03Stormchaser »

Awesome modis sat image from monday, to be viewed in 250m per pixel! \:D/
http://rapidfire.sci.gsfc.nasa.gov/real ... 0.250m.jpg
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by Manukau heads obs »

thats chasing for you, and part of the challenge, trying to know which cell to chase ! :)

love that high res sat image :)
especially all the coastal cu cloud lines
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by mikestormchaser »

03Stormchaser wrote:Awesome modis sat image from monday, to be viewed in 250m per pixel! \:D/
http://rapidfire.sci.gsfc.nasa.gov/real ... 0.250m.jpg
Its an absolute monster steve that CB showen on that sat loop.. great shot there :) ill save that pic.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by 03Stormchaser »

It shows the 2 separate cells, the one to the north that produced Ben's funnel and the one to the south that had the methven tornado, Aaron and myself were stuck some were in the middle!!
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by trickytiger »

Have uploaded some photo's and video's my mate took.

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Overflowing out the gutter

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Usual bit of water on Alexandria Street (happens with lots of rain or too much hail)

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Looking East out towards the sea

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First lot of hail when it first started was almost twice this size


Have got more pics in the album of the hail at: http://s12.photobucket.com/albums/a244/ ... hailstorm/


Video Links:
http://www.youtube.com/watch?v=HX19tPcppRw
http://www.youtube.com/watch?v=mAuN-9r_jkQ
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by DT-NZ »

trickytiger wrote:Have uploaded some photo's and video's my mate took.
Awesome ticky, thank's for uploading these photo's and links . I appreciated looking at them all, what a storm that was!!! I still think about it... powerful stuff.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by DT-NZ »

I think some of the post's are missing from this thread? I was wanted to re-read this storm event and look at all the fantastic storm images... but, they have all gone... now there are only 2 pages in total with 27 posts...

Oh, well... that's ok... perhaps it's the board gremlins... or summin like that...
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by 03Stormchaser »

DT-NZ wrote:I think some of the post's are missing from this thread? I was wanting to re-read storm event and look at all the fantastic storm images... but, they have all gone... and there are only 2 pages in total with 27 posts...

Oh, well... that's ok...
Not sure what you have got going on there, I can see 9 pages and 212 posts!!
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by DT-NZ »

03Stormchaser wrote:
DT-NZ wrote:I think some of the post's are missing from this thread? I was wanting to re-read storm event and look at all the fantastic storm images... but, they have all gone... and there are only 2 pages in total with 27 posts...

Oh, well... that's ok...
Not sure what you have got going on there, I can see 9 pages and 212 posts!!
Hi ya 03Stormchaser :wave: I'm not quite sure what is happening ither... anyway have uploaded a screenshot so the forum admins and mods can take a look.
You do not have the required permissions to view the files attached to this post.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by Nev »

Sounds weird. :?:

I can also see all 9 pages of this thread, with this being post #214, so can't really help either.
Perhaps Foggy or some of the more tech-minded here may have a few clues.
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Re: Canterbury Thunderstorms - 14th December 2009

Unread post by DT-NZ »

Nev wrote:Sounds weird. :?:

I can also see all 9 pages of this thread, with this being post #214, so can't really help either.
Perhaps Foggy or some of the more tech-minded here may have a few clues.
Thank's Nev - I've rebooted my comp, logged on again and I am still seeing the same thing, it is wierd... what I noticed though which I will mention is when I am not logged on I can read all the pages in this thread normally - very unusual.
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