The complex interchangeable conditions sees Marc Marquez lead the field once again after the second MotoGP practice in Brno.
The Spaniard topped the first practice session earlier in the day, and with further downpour throughout the early afternoon, he once again finished on top.
A lap time of 2.03.935s placed him half a second faster than LCR Honda rider Johann Zarco.
Fabio Quartararo finished an impressive third on the Yamaha, but the biggest success came in the Aprilia garage as both Marco Bezzecchi and Jorge Martin secured fourth and fifth place.
Jack Miller booked a Q2 place after finishing sixth for Pramac Yamaha, lapping quicker than Honda’s Joan Mir and Tech3 KTM rider Enea Bastianini.
Gresini’s Alex Marquez crashed with six minutes left on the clock, but dashed back to the pit to get on his spare bike and secured a Q2 place on his final run.
Pedro Acosta rounded off the top ten, pipping Trackhouse rider Raul Fernandez and the second Gresini rider of Fermin Aldeguer.
Francesco Bagnaia couldn’t qualify for the second phase of qualifying as he finished in a lonely 13th.
Alex Rins, Brad Binder and Fabio Di Giannantonio occupied 14th through 16th and all three riders were separated by under a tenth of a second.
Pol Espargaro finished in 17th as he stands in for Maverick Vinales, lapping faster than Yamaha duo Augusto Fernandez and Miguel Oliveira.
Ai Ogura claimed 20th for Trackhouse, finishing ahead of the Honda duo of Taakaki Nakagami and Luca Marini.
