Piers Corbyn at www.weatheraction.com is a commercial business but doesn't really give much away about his methodology. Richard Holle appears to follow a similar method of prediction and is open to all to evaluate – see www.aerology.com – look at the blog/research section.
See further on same subject at http://tallbloke.wordpress.com/2012/04/13/richard-holle-u-s-tornado-acti… and http://wattsupwiththat.com/2012/03/01/tornado-outbreak-tracking/#comment…
Some further comments worth repeating from Tall Bloke's Talkshop … at 6.42pm April 13th 'the main reasons for black holes seems to be to save the gravity only theory which can't explain the rotation of galaxies any other way. Anthony Perrat, at Los Alamos Laboratory, created a computer model of a spiral galaxy without the need for a central black hole by making a few parameter changes involving electro-magnetism …' and follows with an image of such a spiral galaxy forming on a computer screen.
RA Cook at 7.52am April 14th (Barycentre post) … I think we need to look at barycentrism not as solar physicists generally do, seeing the planets as small points trying to move a single large solar mass but rather as a number of unbalanced weights orbiting a tumbling, roiling, turbulent loose fluid of plasma and loops of light gasses pulled together by gravity but simultaneously repulsed by competing newly upwelling loops of electrically charged plasma … etc etc.