Roger's SkyPix

Fog & Mist

Ground Fog

Ground Fog

Ground fog typically forms at night, when air in a shallow layer near the surface cools sharply to its dew point, making the relative humidity 100%. It then persists for a short time after sunrise, until insolation (solar radiation) heats the air enough to lower the relative humidity. Here, the relatively cold, dense air which contained the fog collected in a creek bed between trees in the background. The large utility pole at rear seems to float above the fog, creating a temporarily confusing effect. In fact, the pole was on higher ground free from fog, about 1/4 mile away. [A downburst estimated near 100 mph took the same pole down a few months later!]

Norman OK (Apr 98) Looking NW