Notes by Gardner Emmons about the initiation of low advective fogs on Cape Cod are presented. Subsequent measurements made in these fogs confirm his suggestion that mixing and temperature changes associated with tidal currents account for the fog. Puzzling temperature measurements that are at apparent variance with the mixing theory of fog formation are presented. It is proposed that these temperature discrepancies are due to the effects of water vapor condensation on the sea water surface.

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1Hawaii Institute of Geophysics Contribution No. 1212.