MotoGP points leader Marc Marquez led Aprilia rider Scott Redding in a wet second practice session in Austria.
Torrential rain hit the track a few minutes before the start of FP2, which led to the session being delayed by 15 minutes.
It was still raining heavily when the session did start, and only Alex Rins and Johann Zarco explored the track during the first 10 minutes.
Rins was a long way off Andrea Dovizioso's FP1 benchmark and soon pitted, but Zarco stayed out and did several laps on track.
The rain soon abated and Zarco gradually improved his time, lapping below the 1m40s barrier at the halfway point.
With more riders joining the track, Redding took over the lead, gaining time lap by lap as conditions slowly improved.
The Briton's best time was a 1m34.538s when he pitted with 13 minutes to go, but he was then demoted by Marquez.
Championship leader Marquez went faster with a 1m33.995s soon afterwards, just before heavier rain started to fall again - preventing anyone else from making an improvement.
Redding ended up second, 0.543s behind Marquez, followed by the satellite Ducati of Danilo Petrucci and factory riders Jorge Lorenzo and Dovizioso.
KTM's Bradley Smith was sixth, beating Suzuki's Rins by 0.015s. Jack Miller (Pramac Ducati) was more than two seconds off the pace in eighth, as the top 10 was rounded out by Cal Crutchlow (LCR Honda) and the leading factory Yamaha of Valentino Rossi.
With nobody able to improve on their FP1 times, Rossi's 11th place from the morning session means he is set to take part in the first part of qualifying if FP3 on Saturday morning is also affected by rain.
The Yamahas of Zarco and Maverick Vinales were only 15th and 20th, while Dani Pedrosa was 23rd and last, 5.9s adrift.
Franco Morbidelli, who was 13th fastest, has been given a three-place grid penalty for "irresponsible riding" and impeding Aleix Espargaro at Turn 2 in FP1.
|3||Danilo Petrucci||Pramac Ducati||Ducati||1m34.981s||0.986s||8|
|8||Jack Miller||Pramac Ducati||Ducati||1m36.135s||2.140s||10|
|9||Cal Crutchlow||LCR Honda||Honda||1m36.202s||2.207s||11|
|12||Xavier Simeon||Avintia Ducati||Ducati||1m36.950s||2.955s||8|
|13||Franco Morbidelli||MVDS Honda||Honda||1m37.105s||3.110s||10|
|14||Tito Rabat||Avintia Ducati||Ducati||1m37.296s||3.301s||10|
|15||Johann Zarco||Tech3 Yamaha||Yamaha||1m37.361s||3.366s||14|
|17||Thomas Luthi||MVDS Honda||Honda||1m37.772s||3.777s||9|
|18||Karel Abraham||Aspar Ducati||Ducati||1m37.876s||3.881s||13|
|19||Hafizh Syahrin||Tech3 Yamaha||Yamaha||1m38.072s||4.077s||14|
|21||Alvaro Bautista||Aspar Ducati||Ducati||1m38.892s||4.897s||11|
|22||Takaaki Nakagami||LCR Honda||Honda||1m39.349s||5.354s||12|