On the Causes and the Forecasting of the California Fog*

*This lucid and valuable contribution to one of our most important practical problems was made during the author's visit to the U. S. in 1935–36 ; it is reprinted here from the Jn. Aeron. Sci, June, 1936, with the kind permission of the editor, Prof. J. C. Hunsaker, in response to a wide demand, since the Jn. Aero. Sci. is inaccessible to many meteorologists; Dr. Petterssen has kindly loaned the blocks for the figures.—Ed.