Hot-wire and hot-film sensor signals, measured in free flight, are employed to investigate the transition process for inflow conditions in the convective atmosphere which are related to high inflow turbulence. After a brief discussion of the main measurement techniques, e.g. constant temperature anemometry combined with simultaneously sampled sensors, an introduction to the boundary conditions is given. Finally, the disturbance development is described as function of frequency and turbulence category and amplitude ratios for dominant modes are compared to linear stability theory (LST). These results indicate a TS-wave driven laminar-to-turbulent transition for all encountered turbulence levels.