Winter snowy woods

Frost on trees can catch the evening sunlight as well as snow. Misty fog is commonly associated with cold, stable air masses.

Light rays can occur any time of year, but the fact that mist is generally stable air makes it more common in the cold. For mist to move, there must be some level of wind, otherwise only the sun will move through the trees. Wind and fog are less commonly seen in the same place. For some winters in a row in Oregon’s Willamette Valley, there was not a single foggy day with clear skies above. The winter of 2005 had many a perfect fog day, however!

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