Modeling ridges along curved surface with curve attractor


I need some help on modeling surface ridges that gradually smooth out along the surface, sample images attached. These ridges need to wrap around the exterior facade. I’ve tried pulling the surface towards a curve attractor but this results in a gradual pull – the intended effect is a sharp edge which gradually blends in with the rest of the mass.

Any ideas would be a tremendous help…thanks a ton! Also, non-grasshopper solutions are welcome, in case there’s a simpler way of doing it only in rhino.