Fog Above Wageningen, Netherlands
March 14, 2007
This intriguing photo showing a sea of fog swallowing the city of Wageningen (in the central Netherlands) was taken from the 17th floor of a high-rise residence building, just after sunrise on December 17, 2006. The fog layer was approximately 40 m (130 ft) deep. The temperature (and dewpoint temperature) at the ground was about -1 C (30 degrees F) and the wind was calm --a high pressure system was entrenched over northwestern Europe. Under such conditions, radiational cooling at the surface often reduces the temperature to or below that of the air mass dewpoint, resulting in the formation of minute, suspended water droplets (fog).