(5a) Cumulus humilis radiatus: the Latin term radiatus refers to rays, as these formations can converge on the horizon as rays do. I snapped this picture in Carpentersville, IL. There were rows after rows of these incredible formations and seeing as they are commonly referred to as “cloud streets”, it was like looking at heaven’s express lanes…
These (most probably) formed over land as relatively unstable air flows over an obstacle and convection (process which gives birth to most cumulus) is caused by friction or shear.
“A cloud does not know why it moves in just such a direction and at such a speed…It feels an impulsion…this is the place to go now. But the sky knows the reasons and the patterns behind all clouds, and you will know, too, when you lift yourself high enough to see beyond horizons.”