It is generated by really strong convective indexes at really low levels of the troposphere, and a conducive environment at middle level (mid-level mesocyclon embedded in a major convective cell). It will generate a hook-echo after few seconds of the development of the main mid-level features. A high wall cloud will develop if the low-level moisture is high enough (+/- 90 %). The tornado itself will begin as a typicial multi-vortex tornado (vorticity may be too high, so the normal unique funnel will not develop), winds over 100 miles per hour. When its development as a typical tornado (a low-level feature, perhaps one or more typical funnels, increasing mid-level shear) is complete, a new feature (an eye-like calm center) develop in the inner core of the system, as the external vortexs inc