Single-star scintillation spatiotemporal cross-correlation functions enable estimates of altitude, CN2 and horizontal wind velocity of each atmospheric turbulent layer between 2 and 20 km to be made. Furthermore, for the first time with such a technique, the standard deviations &sgr;v of the horizontal wind fluctuations are also estimated. The experimental results are compared with those obtained by other methods and good agreement is found. The &sgr;v estimations are interpreted in terms of the horizontal wind velocity spectrum and the measurements extend into the buoyancy range. These results encourage the belief that the use of a faster correlator will enable us to experimentally sample the buoyancy range for length scales ranging from 100 m to several tens of thousands of meters. ¿ American Geophysical Union 1990