Author Topic: SE Aust Severe Storms (incl possible VIC tornadoes) 19 - 22 December 2007  (Read 42922 times)

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Offline Jimmy Deguara

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Re: SE Aust Severe Storms (incl possible VIC tornadoes) 19 - 22 December 2007
« Reply #60 on: 31 December 2007, 05:28:31 AM »
To add to the link Phil suggested above, here is a excerpt with the link:

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Hi Harald,
 
These are captures from the video sequence with some basic descriptions. 
http://www.stormchasers.au.com/20_12_07.htm
 
I had a look at the public available radar and noticed the significant storm appearing north of Cressy which appears to show a large hook echo of sorts, and then I suspect a propagating boundary moved northeast to generate the QLCS as suggested by you.  It was interesting your mention of decoupled vorticity - could this explain the 2 funnels along the line prior to the 'main event'?
 
The sequence shows what I initially missed at the start - behind the lowering which I dismissed as scud, closer examination shows what appears to be a ground connection of vorticity.  The tornado developed very rapidly to the point where I was overwhelmed by how quickly things went from that point.  Interestingly the 2 funnels didn't appear to move very much, but the tornado, after developing, moved to the ENE quite rapidly.  In the final sequences, rain appears to wrap around the vorticity centre which now develops into a large bell shape with a collar.
 
I hope these images will be of use in your research in atmospheric oddities, and I would be very happy at some stage to go over the video and get a deeper understanding of the processes particularly with your radar analysis and experience in severe weather.
 
best regards.....Clyve Herbert

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Phil, given you saw these video stills, what are your thoughts from what you see?

Regards,

Jimmy Deguara
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Offline Mike

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Re: SE Aust Severe Storms (incl possible VIC tornadoes) 19 - 22 December 2007
« Reply #61 on: 31 December 2007, 07:48:33 AM »
Yes, thought it looked like a tornado given its structure and going on what i've read, seen etc on a limited basis.  I would also like to see if there was any damage path whilst it was grounded.  I shall ask Reed to jump on and have a look at this thread for his input.

Mike
Darwin, Northern Territory.
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Lightning Research 2010/14

Offline Jimmy Deguara

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I have received feedback from Gene Moore, who has seen more tornadoes than most chasers, suggests unless the video is void of motion, then there is no doubt it is a tornado. The video supplied is fairly poor quality in determining the existence of motion.

Regards,

Jimmy Deguara
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Offline Mike

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Hi Jimmy, Reed is looking at the photos as you asked and will get back to me asap on this topic.  He'll either post a comment or relay the info via email for me to paste.  Gene's expertise in this area is infamous and this thread has received some excellent comments from all regarding the event.

Mike
Darwin, Northern Territory.
StormscapesDarwin.com
Lightning Research 2010/14

Offline Jimmy Deguara

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Chuck Doswell has also commented suggesting that he tink the latest stills show a tornado. Again he awaits to see if there is motion visible.

Regards,

Jimmy Deguara
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Gambit

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Hi all,

Jimmy has the video been posted anywhere i.e. youtube or anywhere else in the public domain? Or is that what everone is waiting for???

Cheers

Mathew

Offline Jimmy Deguara

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We can almost confidently say now with the most recent video stills that the feature is in the form of a funnel. The video would just confirm more in terms of motion.

Clyve is rather busy at the moment but is making every effort to ensure some possibility of getting it online.

Regards,

Jimmy Deguara
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Australian Severe Weather
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Australian Thunderbolt Tours
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Phone  0408 020468  (International :  61  2  408 020468)