Abstract
From surface‐water and air temperatures 7 m above the water, it was found that over Lake Michigan in winter, a vapor pressure difference of about 5 mb between air and surface water was necessary for “steam‐fog” to form when the water was between 0° and 5°C. With a smaller vapor pressure difference there was no “steam‐fog” with a greater difference than 5 mb there was dense steam‐fog. The wind‐velocity and lapse‐rate determined the character of its appearance after “steam‐fog” had formed. Conditions favoring its formation over the lake are most frequent in January. There are fewer occurrences in December, February, and November.

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