Precipitation Shaft- A visible column of rain and/or hail falling from a cloud base. When viewed against a light background, heavy precipitation appears very dark gray, sometimes with a turquoise tinge.
Rain FootSlang for a horizontal bulging near the surface in a precipitation shaft, forming a foot-shaped prominence. It is a visual indication of a wet microburst.Rain ForestA forest which grows in a region of heavy annual precipitation.
Rain Foot - A horizontal bulging near the surface in a precipitation shaft, forming a foot-shaped prominence. It is a visual indication of a wet microburst.
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Note the rotating, vaulted Cb adjacent to the anvil precipitation, and the dark precipitation shaft in the left-center, emanating from an area that would be visually rain-free in a classic supercell.
Tornadoes and funnel clouds are usually pendant from wall clouds or directly from the thunderstorm base, within a few miles to the southwest of the precipitation shaft.
 See also: Cloud, Precipitation, Storm, Updraft, Tornado
  
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