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-   -   Oct 17, 2007 Ontario Stormchase/Cold Core (http://www.ontariostorms.com/showthread.php?t=211)

Itchy 02-13-2010 11:57 AM

Oct 17, 2007 Ontario Stormchase/Cold Core
 
Was a good day for October!
Long lived cold core that I intercepted North of London took me quite a distance away from town. I had to head ENE to keep up.

The chase began with an interesting event, an updraft formed fast ahead of the main line. it looked like something from a warm front not a cold core.
This shot is me looking up its north side.

http://farm4.static.flickr.com/3186/...6b2008b7dc.jpg

As I approach a sinking motion becomes apparent on the backside, I'm driving south because I overshot how far north I wanted to go. durr

http://farm4.static.flickr.com/3026/...5b93619c_b.jpg

Here a small area of rotation persisted for a few minutes before falling apart. It had some decent speed to it, no funnel though.

http://farm4.static.flickr.com/3239/...7238b685_b.jpg

The updraft began to fall apart after that, also the gust front was catching up behind me now from the west

http://farm4.static.flickr.com/3193/...9abace8887.jpg

Now under the original updraft, this was my view looking straight up. Some rotation still was going on slowly.

http://farm4.static.flickr.com/3210/...81dd3ab1f6.jpg

This had some kind of horizontal tube in it, but fell apart fast.
http://farm4.static.flickr.com/3128/...45733c86_b.jpg

This feature was rotating, had a circular shape inflow tail and lasted around half an hour changing shape, so I want to call it a wall cloud. I still think it was odd though forming from a cold core right next to a weak gust front...

Here it is early on
http://farm4.static.flickr.com/3144/...62fa8e916b.jpg

About 20 minutes later it had become this! With good rotation and inflow tail still, the side on the right of the image had the most intense motions.
http://farm3.static.flickr.com/2229/...5e23218b_b.jpg
Here it was about ten minutes later, a lot weaker than before but still spinning a bit
http://farm4.static.flickr.com/3188/...991197b567.jpg

Southern edge of the core had a neat feature on it now and LOTS of cg's
http://farm4.static.flickr.com/3082/...b84317b531.jpg

another 15 minutes or so later the dying wall cloud made one final appearance change, I had caught up to it finally!
http://farm4.static.flickr.com/3284/...7ebcc1bc_b.jpg
After that it finally fell apart for good, I then decided to head north into the core then west and see what was up with the north side..... I saw a nasty looking line with a pocket of intense vertical motions; I followed for awhile until it too fell apart.

Here is the view coming out of the core

http://farm4.static.flickr.com/3187/...a64ea2f5bf.jpg

getting closer, strongest up motion was the area right above the road

http://farm3.static.flickr.com/2001/...f258c96e_b.jpg

Last shot I take on the way back as the system weakens
http://farm4.static.flickr.com/3155/...27ca21df9d.jpg

This little guy was in London and had some rotation! Nice surprise on the way home
http://farm4.static.flickr.com/3162/...78c0d3c6_b.jpg

This even smaller one had a small anvil downstream and some rain and an inflow tail!
http://farm4.static.flickr.com/3248/...dc56c3a120.jpg

[media]http://www.youtube.com/watch?v=maLDm-L6Fxs[/media]


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