Steam Fog
Scientifically it is caused by very cold air mixing with a thin layer of warmer air directly over a relatively warmer body of water. The warmer air reaches the dew point as it cools and fog is formed. A convective effect causes the fog to rise like steam. The water has to be about 10 degrees C warmer than the air so this usually only happens on very cold days. Aesthetically it is beautiful and one of the few good reasons to go outside when it is -25 C.
Steam Fog
Scientifically it is caused by very cold air mixing with a thin layer of warmer air directly over a relatively warmer body of water. The warmer air reaches the dew point as it cools and fog is formed. A convective effect causes the fog to rise like steam. The water has to be about 10 degrees C warmer than the air so this usually only happens on very cold days. Aesthetically it is beautiful and one of the few good reasons to go outside when it is -25 C.