The key to success in motorcycle racing is about controlling as many variables as you can. There are two variables which riders and teams cannot control, and which they fear for that very reason: the weather and crashes.

The weather spared both MotoGP and Moto2 at Brno on Saturday, but played havoc in Moto3. Crashes, too, made life difficult, both for MotoGP and in Moto3. It made for an intriguing day of practice.

The day started under leaden skies, with the threat of rain ever present throughout the morning. Dark clouds rolled in, then rolled right out again, chased deeper into Moravia and away from the track. They broke only briefly in the afternoon, the Moto3 qualifying session the main victim.

Standing at trackside, the rain came and went so quickly that by the time I posted an update on Twitter, the weather had changed, immediately contradicting me. In the end, a red flag saved my blushes, Phillip Oettl crashing and damaging the air fence, causing the session to be halted while the air fence was repaired.