Abstract
In the previous paper it was verified that the distance variable along the stream path was useful to describe the pressure field on the surface of a model in a natural wind. This paper indicates that the more precise analysis is possible by replacing the previous concept of the stream path variation with the curvature of stream path. The discover of the obstruction component in the variation of the curvature against the flow pattern completion clarifies the difference between a flow field in a natural wind and that in a boundary layer wind tunnel in lower Reynolds number condition.