You've gotten some good responses, but I wanted to add a couple of things.
First, don't corner yourself into thinking of the reflector as "fill" light -- it can also be the key light, with the sun providing accent lighting (or rim lighting). You'll need to get the reflector in close, so that you get shadows from it. (Shadows are what provide form, and are not always to be avoided, as many seem to think.)
Second, a white reflector will provide (properly used) a large, diffused source of light. A silver reflector, generally speaking, will provide nearly a direct reflection of the sunlight. A silver reflector, therefore, will tend to produce more "hotspots," or specular highlights. Not bad in and of itself, but it should be part of your thought process in producing the photo.
Finally, wind does not directly affect the light from a reflector. Impossible. It can, however, affect the reflector and change the quality of the reflected light. If the wind causes the reflector to bow in or out, then the light will tend to be harder or softer. But wind does not blow light around.
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