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Abstract A comprehensive study was made of pilot-reported occurrences of high level turbulence (more commonly referred to as CAT) over the United States from September 1960 through August 1962. The data consist of 12,126 reports of moderate or severe turbulence above 15,000 ft. The tabulations presented include the distribution of turbulence by months, seasons, altitude, and geographical location, and its association with such meteorological items as: the position with respect to the jet stream, curvature of the jet stream, strength of the isotach center, streamline curvature, troughs, closed or cut-off Lows, and mountain waves. Some additional data are included for levels as high as 70,000 ft.

SUMMARY OF HIGH LEVEL TURBULENCE OVER UNITED STATES