Hi, I am a Houdini beginner with some Maya experiences, and want to switch into be Houdini animator.

Does anyone know tutorials of phenomena animations exist?

I know we can learn some basic from gnomon DVD, 3D Buzz videos, Sidney VisLab videos, and examples in Houdini help.

However, I am particularly looking for tornado, ocean wave, fire, and explosion.

Thanks!

At 3Dbuzz right now is a tutorial on tornados. I find ODDforce to be a great forum as well. If you watch enough tutorials mix and matching will happen to get were you want to go.