Quali and race pace are often different, the weather just makes that difference even more pronounced.
If you mean a driver can be ahead in 3rd practice and then the weather changes and they are nowhere in Quali; practice times shouldn't be compared to quali as you don't know the fuel load and set up of all of the cars.
We know that certain cars are better suited to certain tracks, and when you combine this with aggressive in-season development, it's no surprise that teams are trading places over different weekends when you consider how close they all are to begin with.
Chuck in a bit of luck (good and bad) and I don't think it's as random as your suggesting.
If you mean a driver can be ahead in 3rd practice and then the weather changes and they are nowhere in Quali; practice times shouldn't be compared to quali as you don't know the fuel load and set up of all of the cars.
We know that certain cars are better suited to certain tracks, and when you combine this with aggressive in-season development, it's no surprise that teams are trading places over different weekends when you consider how close they all are to begin with.
Chuck in a bit of luck (good and bad) and I don't think it's as random as your suggesting.