for scene 40 of the video " Water Crisis: Healing the Colorado River - part 1" by Rolf Witzsche
here for a larger image
The intensity of cosmic-ray ionization
Strong, induced ionization can also affect the process. Ionization by cosmic-ray interaction can induce the dew nucleation at levels of water-vapor density that normally would not cause any rain. The intensity of cosmic-ray ionization, which produces the most powerful ionization in the atmosphere, can have amazing effects on cloud condensation and subsequent rainfall.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.