Pyrocumulus congestus may thus form under those special circumstances that can also cause severe turbulence. Cumulus congestus can also be associated with fair weather waterspouts forming from rotation at the open water surface being stretched and tightened under their updraft. Landspouts most often form under congestus, as well. Both of these non-mesocyclone associated tornadoes typically dissipate when a more pronounced precipitation shaft forms and the downdraft cuts off this process. In highly sheared environments or within the flanking line of a supercell congestus can rotate and on rare occasions produce mesocyclonic type tornadoes, with waterspouts and landspouts emanating from misocyclones, a related but distinct process. Turkey tower Turkey tower is a slang term for a narrow, tall, individual towering cloud from a small cumulus cloud which develops and suddenly falls apart. Sudden development of turkey towers could signify the breaking or weakening of a capping inversion, and an area where these consistently form is an "agitated area", a term that applies to congestus generally. See also Atmospheric thermodynamics Convective instability Cumulus castellanus cloud Pileus Bibliography American Meteorological Society - Glossary of Meteorology References Cumulus