Radiation Fog in Topanga Canyon
July 01, 2009
Thermal energy in the form of infrared radiation is continually emitted from the ground into space. On clear humid nights, this loss of energy results in cooling the ground. The air immediately above the ground is then, in turn, cooled below the dew point. When this happens, fog forms and hugs the ground. This picture was taken in Old Topanga Canyon, California, at sunrise one morning in May 2009. The shallow radiation fog settled into the lowest and coolest parts of the canyon, leaving hilltop homes perched above the patchy sea of gray.