ABSTRACTExisting meteorological controls of water exchange by precipitation and evaporation on the Great Lakes are almost entirely inadvertent and related to man's urban‐industrial complexes and their effect upon precipitation processes. These inadvertent effects have led to 10 to 40 increases in precipitation in localized areas within the basin. Envisioned growth of urban‐industrial complexes within the Great Lakes region should lead to more inadvertent weather modification in the Basin. The only existing planned weather modification efforts are those at Lake Erie which are attempting to eliminate by redistribution the concentration of lake‐derived heavy snowfall along the south shore. It appears reasonable to assume that practical increases of lake precipitation on the order of 5‐20 could be achieved on an operational basis over the Great Lakes in the next 10 years, but the time of accomplishment will depend on national priorities, international cooperation, and economic factors. These activities would certainly produce a sizeable increase in the water quantity of the Great Lakes and should result in an improvement in water quality. Operational methods of evaporation suppression applicable to the lakes are just not available. Meteorological controls to ameliorate certain undesirable lake‐effect snowstorms are a nea
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