After two days of dry practice and qualifying, and dry conditions for the 125 and 250cc races, rain began pouring down at Sepang with just 25 minutes to go before the Malaysian MotoGP race.
The race start has now been delayed due to the weather conditions, with the storm predicted to last at least 30 minutes.
Valentino Rossi is expected to clinch his seventh MotoGP title in today's race, which he will start 38 points ahead of team-mate Jorge Lorenzo.
