For some interesting discussion of the current "state of the art" in
lightning causation and the big problems lightning physicists are thinking
about:
On "runaway phenomenon" with an emphasis on their role (or not) in sprites
in Physics Today:
http://www.physicstoday.org/pt/vol-54/iss-11/p41.html
here's a power point presentation by Earle Williams at MIT
http://www.lc.leidenuniv.nl/lc/web/2005/20050509/presentations/Earl%20Williams.ppt
there's some very nice images in there showing the dendritic development of
lightning, as measured by the RF direction finding system near Huntsville
Alabama. I've seen some animations of the data from this system, and it is
very, very impressive. Amazing what can be done with some fairly simple
receivers with a precision GPS timing clock connected.
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