In this Icaristics article Bruce Goldsmith explains the Hexagon Theory (thermal cloud forming and cloudstreets) and how to use it for flatland flying.
I first found out about the hexagon theory of cloud formation in 1992. It helped my own understanding of the sky and improved my XC flying significantly. I wrote an Icaristics about it at the time. Since then I have always had it in the back of my mind when looking at cloud formations.
Let me start by explaining the Hexagon Theory from the beginning. In the 1980s there was a group of French meteorologists who went on a trip to the Sahara to study the way that clouds form in a region with no thermal sources… click to continue