When we say that conditions make a huge difference in MotoGP, we usually meant that a track which was drenched in rain, or a one which was drying and changing, effected the outcome of the race. But there are a couple of race tracks in the world where the wind can have a huge impact on the way a race plays out. One of those places is Assen, where the wind sweeps up from the south east unimpeded by any geographical obstacles and straight into the faces of the riders coming out of the Strubben hairpin and heading down the Veenslang back straight. (Though like all of the straights at Assen, it isn't really that straight. It weaves and winds down to the fast right at the Ruskenhoek.)
On Sunday, the wind, which had picked up significantly compared to the day before, produced three barnstormers of races. It kept a huge group together until the end of the Moto3 race, it produced a thrilling Moto2 race decided in the last laps, and it even helped to bunch the MotoGP riders up, and create drama for most of the race.
The wind, combined with the fact that Assen has so many high-speed changes of directions make it immensely physically demanding. Hustling a MotoGP bike from side to side is never easy, let alone when you have to do it at over 200 km/h. The laws of physics turn momentum into an unstoppable force which you have to overpower if you are to make the next corner.