Fall streaks occur in Cirrus clouds that make the clouds look as if someone pulled the bottom of the cloud down while the top looks solid. This formation is caused by ice crystals that fall and eventually evaporated before hitting the ground.
I observed these fall streaks on Wednesday (March 6, 2013) while heading to
Wind direction and speed, as well as how fast the ice
crystals fall will determine the shapes, sizes and how “wispy” these clouds