Not sure why Clarkson is surprised. You pump a million gallons of hot water vapor into the air and it will form a cloud. As it cools, the water will condense and fall as rain. It's not rocket science.
Oh, wait......
As far as internships go,
the Lunar and Planetary Institute (LPI) at Johnson Space Center in Houston offers some good opportunities. I was an intern there during the summer of '96. Coolest summer ever. I learned a ton about multispectral imaging. And that was in the "old days" when you had to work on Solaris workstations and most of your images were binary code zipping by. Modern graphics software must make it a really cool field to work in these days.