Evaporation fog

Woke up this morning and the thermometer on the porch read 18 degrees F, the coldest yet! No significant snow yet, but it is on the way. The ground and all the trees were all white with frost, in the sun it sparkled like diamonds.

The lake across from the cabin had a thin layer of steam fog advecting across the surface. It is caused by a cold air mass passing over a warm moist surface, this is also why it as known as evaporation fog. In this case the lake has not frozen over yet and is warmer than the air temperature (even though that lake is no where close to being warm enough to swim in).