In this video I cover how they create these storms.
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Links:
Rocket Test NASA locations:
http://rockettest.nasa.gov/:
Video of NASA testing the J-2X rocket (confession they create rain clouds):
http://blogs.nasa.gov/cm/blog/J2X/posts/post_1289340446851.html
What Exactly Is 39529?:
http://www.nasa.gov/centers/stennis/39529/39529.html
TM-65C:
https://www.youtube.com/watch?v=LQF8hsitxvY&feature=related