This study has aimed at correlating experimentally determined atmospheric flow fields against available theories for air flow over natural obstacles. As a result of these attempts it may be stated that: a. From the differential equation of micrometeorological flow of Raethjen, it was not possible to define the type of flow from the parameters included in the theory. b. For the wave-like airflows, wavelengths computed on the basis of short gravity waves were found to agree with experimental results in the level l to 4 km only. c. The theories of Lyra and Queney predict waves to the lee of the obstacle. In the exploration waves were also found windward of the ridge. The theories of Ringleb and Sekera appear worthy of experimental test. For the Ringleb theory a special instrument which measures air density directly will be needed. The physical basis for such an instrument is available by utilizing the aerodynamic properties of the sailplane. The extension of the exploration to a larger ridge is indicated by the experiences of this experiment.
