As a bearer of smoke the lake breeze creates a problem in forecasting visibility. A study of three summers totaling thirty-three occurrences suggests a number of criteria for judging the probability of the lake breeze, time of occurrence, and density of smoke. These include the necessity for nearly clear sky, light winds with a preference shown for northerly winds, and a surface pressure pattern of relatively high pressure. A suggested forecast procedure is included.

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* This paper was read by the author before the national meeting of the American Meteorological Society at St. Louis, Missouri, January, 1950.