Wind velocities from the surface to or above 50km, measured by meteorological rockets at White Sands, New Mexico, have been analyzed for a period of 2 years from January 1963 to December 1964. The Eulerian space correlations and the normalized energy spectrums have been computed for the mesoscale velocity fluctuations. It is found that the normalized energy spectrums for both the longitudinal and transverse velocity components appear to be similar for all seasons and are approximately proportional to k−2 in the range between 6×10−2 and 4×10−1 cycle km−1. A spectral peak occurs between 3×10−2 and 6×10−2 cycle km−1. The monthly mean kinetic energies of the mean and eddy flows have also been computed. It is found that the winter stratospheric westerly jet generally is associated with more eddy kinetic energy than the summer easterly jet and that the variance of the velocity is approximately proportional to mean velocity in the stratospheric westerly jet.