I agree with the idea that they can produce turbulent conditions on their own. However, given the conditions in Sydney proving it was a building and not just the very poor weather is what I'm getting at. If it happened to be just wind on a sunny day, maybe it would be looked at more, but with all the stuff going on I'd hazard a guess this may just be a wet runway and extra speed due to the inclement weather, maybe a bit of get it on the ground.