That's a lot of rime ice!

This is one of the radio towers just outside the observatory gate on top of Mt. Lemmon. For much of the 13th, the peak was covered in clouds and it was coooold. In the teens, Fahrenheit with high winds. The super cooled moisture in the air instantly froze to any exposed surface, buildings, cars, posts, trees, anything.

Near ground level, there was between 8 - 10 inches of rime ice on the upwind surfaces, but this tower, sticking up well into the cloud got the worst of it. The antenna at the top has an accumulation of 18 inches or more!

Canon 20D - 1/60th second, 67mm @ f/ 16, ISO 100