A wall cloud (or pedestal cloud) is a large, lowering cloud formation that develops beneath the base of a cumulonimbus cloud that often forms tornadoes. It is typically beneath the rain-free base (RFB) portion of a thunderstorm, and indicates the area of the strongest updraft within a storm. Wall clouds are sometimes an indication of a rotating mesocyclone in a thunderstorm, and most strong tornadoes form from wall clouds. However, wall clouds do not always rotate.
Read more about Wall Cloud: Genesis, Structure, Supercell and Tornado Significance
Famous quotes containing the words wall and/or cloud:
“I make myself this time
Of wood or granite or lime
A wall too hard for crime
Either to breach or climb....”
—Robert Frost (1874–1963)
“When I from black and he from white cloud free,
And round the tent of Godlike lambs we joy,
I’ll shade him from the heat till he can bear
To lean in joy upon our father’s knee;
And then I’ll stand and stroke his silver hair,
And be like him, and he will then love me.”
—William Blake (1757–1827)