Why do you think you would need one? Here, we're talking about wind, by and large, as a weather (or meteorological) phenomenon in general and not as a specific or unique instance of wind such as the north wind or the south wind. This would be the same thing as snow, rain, hail, sleet and so on and so forth, when we're referring to these weather events as meteorological conditions in general and not as specific instances of them. For example, "It took me two hours to shovel all the snow off the driveway." Here, we know what snow we're talking about—the one that was on the driveway. That was a specific instance of snow. Take a look at these two examples which I pulled off the Web:
Plus, there were banks of snow everywhere and it was freezing cold, which didn't encourage you to go out anyway.
A messy mix of sleet and freezing rain could create slick driving conditions today and Friday in the Lower Hudson Valley.
Another possible way to explain this that I can come up with is that this is in principle similar to how we say things like three bottles of beer, a glass of milk, two bottles of shampoo etc. When you say that you want a bottle of beer, you're not talking about any specific beer. Beer without a definite article here refers to the substance in general. You can think of eddies of wind in a similar manner. There is this substance (meteorological phenomenon) called wind and you've got just only a bunch of eddies of it (an eddy is just an amount).
Would you say my answer is making more sense to you now?