I think the tornado you are looking for is called a vortex. You may have better luck chasing up threads about vortex marbles in some of the boro threads but remember that boro is much stiffer and shock tolerant than the softer glasses and you can learn to do things in boro quickly that take a lot of practice to accomplish in soft glass.
I lean heavily on youtube videos from Corning Museum of Glass and I google lampwork videos to try to find the webpages of artists that have videos to watch for free. A lot of them don't post to you tube but have a half dozen on their websites free for just visiting the site.
I am also very addicted to the book Passing the Flame.
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