A Cloud and Its Shadow

A Cloud and Its Shadow

 

A cloud is a living organism - A cloud is not a solid body floating in the air. In actuality, air enters the cloud at some location, such as cloud base, and exits the cloud somewhere, like at the top of the cloud or even around its sides. The cloud is like a living organism, taking in and eating water vapor and dry air and expelling liquid and/or frozen water and water vapor and dry air. Although the boundary between a cloud and the clear air adjacent to it may look unambiguous, there are invisible air currents just outside the visible cloud which are part of the cloud system. We must consider the effects of forces on the motion of individual air parcels as they move from the unsaturated area outside the cloud, into the cloud where they get nice and wet, then out from the cloud where they evaporate or sublimate, rather than forces acting on the entire cloud itself. A cloud can be changing its appearance and characteristics with time as air parcels move around into it and out from it. The analysis of clouds is much more complicated than that for solid objects.

 

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