I was just reading a jet stream map (attached) and wondered how the direction the jet stream flow is moving at any one time might affect turbulence. For example, if I were travelling from LHR to JFK, would I be more likely to feel bumps as the plane passed south of Iceland? Or would the bumps be more prominent as it crossed New Foundland? Or would it be possible that there would be no bumps?
I guess I'm asking how jet stream maps can be interpreted for turbulence potential.....