On Jul 23, 2007, at 3:54 PM, Rick Tejera wrote: > Since cumuloform clouds are convective in origin the height at > which they form is typical the height of > convective turbulence. cumuloform clouds "form" or appear when the rising air mass cools to the dew point temperature. turbulence can and often will exist from the ground up; far below the height at which they form. ................sam -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.