On Mount Tamalpais Above the Fog

December 05, 2014


Photographer: Jon Marcus; Jon's Blog
Summary Authors
: Jon Marcus; Jim Foster

On my way to a star party atop Mount Tamalpais, California, I stopped to take these photos above a layer of fog over-riding the San Francisco Bay area -- about 10 mi (16 km) away. This advection fog was part of a marine layer that routinely develops along the coasts of northern California during the summer months when warm, dry air rising over the Central Valley is replaced by cooler, Pacific air. Frequent incursions of moist air create an ideal environment for conifers such as Douglas fir (Pseudotsuga menziesii), seen here cloaking the slopes of Mount Tamalpais. Photo taken on August 2, 2014.