Abstract
Abstract This paper presents an investigation of the synoptic climatology of the precipitation regime in the Upper Midwest. The annual march of precipitation is characterized by a bimodal distribution, with maxima occurring during the months of June and September. Midsummers are noticeably drier. Using daily precipitation and twice-daily 700 mb height data for the period 1950–1979, composite difference maps of the 700 mb height field corresponding to wet and dry Junes, Augusts and Septembers were constructed to identify the nature of the difference in midtropospheric circulation associated with the midsummer minima and the September maxima. Correlation of monthly total precipitation with monthly precipitation event frequency was undertaken to determine whether precipitation during the summer months is the result of a small number of high-intensity storms or in fact due to the frequency of less intense rain events. The influence of North Atlantic tropical cyclones on the late summer precipitation was inves...
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