Chaos theory actually says (much abbreviated, but bear me out…) that some systems over the long term are very sensitive to initial conditions, so can’t be accurately simulated to a fine level of detail. So a the existence or otherwise of a windfarm may have an effect on this year’s atlantic weather patterns, but so might the logging or otherwise of a forest, or your decision whether or not to turn your heater on tomorrow.
It is for this reason that climate scientists talk about, well, climate rather than weather, cos climate is an average over time of the weather, and so smooths over the short-term perturbations caused by this sort of thing. They talk about ‘increased RISK of storms’ or ‘decreased average rainfall’ rather than ‘oh noes we must cut co2 emissions or it’ll rain on grand final day in 2079’.
But if you actually want a simple answer - all other things being equal, wind farms are more likely to reduce the severity of storms than otherwise. Why/ Because wind farms sap the energy of weather patterrns. That’s the whole point of wind farms after all - they take energy out of bodies of moving air and turn it into electrical power. And a weather pattern with less energy is one where the winds are not as strong and destructive. Of course, the amount of energy captured by a windfarm is minute on the scale of a weather pattern, so the impact will be infinitesimally small, but what impact there is will more likely result in calmer weather rather than stormier weather, chaos theory notwithstanding.