It typically develops near the precipitation region of the cumulonimbus. A wall cloud marks the lower portion of a very strong updraft, usually associated with a supercell or severe multicell storm.
A wall cloud is defined by the AMS as 'a local, often abrupt lowering from a cumulonimbus cloud base into a low-hanging accessory cloud, normally a kilometer or more in diameter. We are getting down to storm season so for those who like to follow me or the newer chasers out there I am going to attempt to put a little comparison together here to educate a wall cloud vs not a wall cloud.
