for scene 24 of the video " Water Crisis: Healing the Colorado River - part 1" by Rolf Witzsche
here for a larger image
Over the Mississippi and Missouri basin
As the satellite image shows, much of the water vapor from the Atlantic gets trapped and rains out in the low area over the Mississippi and Missouri basin, in front of the high central plains. By the time the atmosphere reaches the Colorado River basin, the water-vapor density in the air has diminished to the point that cloud condensation no longer happens sufficiently for clouds to form, and for the clouds that exist, to rain out. But this does not mean that there is no more moisture in the air. It only means that the water-vapor density is slightly below the dew-point requirements.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.