Earth Day 2006

Clouds over a Wisconsin farm. But look carefully, these are two different types of clouds. There are a few fluffy clouds at low levels, but then clouds that look like UFOs at a higher level. These are wave clouds, formed by mechanical lifting. Since there are no hills substantial enough to cause the lift of air here in Wisconsin, these must have formed when two layers of air "rubbed" against each other enough to produce the wave motion and lift necessary to form the clouds. And just as soon as they were formed, the air descends just on the other side to create these unusual shapes. I used to see these quite a bit while I was in Pennsylvania, but I rarely see clouds like these in Wisconsin.

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