Study: Summer Storm

I remember reading a description of a pre-storm sky as "coppery".  I'm not sure the author meant this color, but it was a fun interpretation for me.  I like the contrast of the laminar flow of a hyper-calm day with the turbulent flow of the cloud edge.  (Yes, I know, calm days don't really have laminar flow.  I'm talking more about emotion than aerodynamics.)

 12"x9" acrylic paper