Over the Backyard Fence

[otherprof]

I just this afternoon learned that clouds like those are called "nacreous."

 

[jeffashman]

Nice shot! Once upon a time I knew all the names of the cloud formations. My dad was a meteorologist, and he and one of my high school teachers, who was also a meteorologist and who worked with my dad, colluded to make one of my summer school sessions very miserable...