Wind data at and above the 500-mb level taken from the El Paso rawinsonde station, and pressure-height data at the same levels from Albuquerque, Midland, Tucson, and Chihuahua during the 1965-66 winter and the 1966 summer periods were used to study geostraphic wind deviation. Geostropic winds were computed directly from the pressure-height data by a finite-difference method and compared to the actual wind as measured at El Paso. The variation of the geostrophic deviation with wind speed and pressure-height was examined. Errors involved were analyzed and the 'true' geostrophic deviation and the total wind accelerations were estimated. (Author).