In a study of the 200-mb Height Chart and associated jet to determine their usefulness in tornado forecasting, a consistent phenomenon was observed, namely, that the majority of tornadoes investigated occurred along or near the −60°C isotherm at 200-mb. More precisely, the western and southern portions of the −60°C isotherm of the cold “pool” it circumscribed were the favored area. The jet at 200-mb in most cases delineated that portion of the −60°C isotherm under which tornadoes occurred. Further, certain consistencies appeared on the tropopause chart that might be related with tornado occurrence.
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Lee et al. (1956) studied this question.