Investigations have shown various meteorological parameters which could be associated with high level turbulence. These and the Richardson Number are analyzed with respect to geographical location, proximity t o the level of maximum wind, proximity to the tropopause, and seasons. The purpose of this study is t o find out under what conditions the correlation between high level turbulence and low Richardson Number was good and under what conditions the correlation was poor. It is found for the

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... st part that using the Richardson Number as a predictor of high level turbulence appears t o be more successful in the eastern half of the country. Two of these parameters are strong vertical wind shear and low stability.