The upper section of a chart shows the direction taken by the Santa Ana winds coming from a high pressure region in the Nevada desert through the mountain passes to the Los Angeles basin. A second part of the chart traces by the hour the formation of summer morning fog caused by temperature inversions. Chart copied February 8, 1938.
Meteorology--California--Los Angeles Weather Fog--California--Los Angeles Maps Los Angeles (Calif.)--Maps Works Progress Administration Collection photographs
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