Great Hoarfrost of February 2012

Last week I experienced possibly the most spectacular hoarfrost event of my life. At approximately 6:30pm Thursday, 2/2/12, freezing fog developed here in Grand Forks. Fog continued until Friday afternoon when it briefly lifted for 2-3 hours. When I woke up Friday morning, the visibility was a dense 1/16 statute miles, or about 300-350 feet. A beautiful hoarfrost developed on vegetation, fences and signs. I took many pictures because I don't recall ever personally witnessing a hoarfrost of such magnitude.  Dense fog re-developed Friday evening, once again thickening to 1/8 statute miles or less. Finally on early Saturday morning, 2/4/12 the fog lifted. Sunshine had developed by mid-day and the hoarfrost melted away. Pretty substantial fog event, with approximately 33 hours of dense fog during a 36-hour stretch. Here is a sample of pictures from "The Great Hoarfrost of February 2012":