Business & Commercial Aviation - "Using Weather Radar to Counter FL Cells"

I consider myself a reasonably smart guy, but I've never understood the Trammel method of doing mental mathematics to use a radar while you're busy flying an airplane.

The guy who taught me how to use airborne radar and had a Ph.D in synoptic meteorology did understand it though...but didn't use that method while flying.

Radar usage is mostly technique, and there is no "wrong" way to use it as long as you're avoiding the worst of the weather.