In A Fog

Heavy morning fog on February 23, 2008 reduced trees at Bowman Woods Park in Cedar Rapids, Iowa to ghostly sentinels. This view looks southeast from near Boyson Road NE and was taken just before 7:30 AM. By mid-morning the fog finally burned off to reveal a clear sky. In winter, when a warm air mass blows over a cold surface (snow or ice), advection fog is formed. At this time the temperature of the air is lowered to its dew point, saturation occurs, producing fog.