I'm getting the impression that some people here don't quite realize the severity of the problem, and why the Schoeps B 5 D was recommended specifically. From the outside, the B 5 D looks much like a simple teardrop-shaped windscreen such as the Schoeps B 5 or some other models which were suggested.
On the inside, the B 5 D is hollowed out between where the capsule fits and the outside surface. This isolates a volume of air around the capsule, including both the front and side/rear sound inlets of a pressure gradient (directional) capsule. As a result, it's far more effective in suppressing wind noise, but doesn't interfere with the microphone's directional pattern or high frequency response as much, as a conventional windscreen.
There's a corresponding difference between the spherical foam windscreens W 5 D and W 5, which of course are somewhat larger, and keep the air turbulence farther away from the capsule membrane.
Unfortunately these "D"-model windscreens are more expensive to manufacture than their simpler counterparts. I definitely wish that high-quality accessories could cost less than they do, but the inexpensive ones just don't work very well when they're needed most.
--best regards