Warm-up for this afternoon's US MotoGP at Laguna Seca has been delayed by an hour due to fog.

The 20-minute session will now start at 10:40 local time.

Foggy conditions were also a factor on Saturday morning and, although visibility was deemed sufficient to start the final practice session on time, the track was almost deserted until the final ten minutes due to the cold and moist weather.

Despite the warm-up delay, the race will begin as planned at 14:00, by which time the fog should have long since 'burnt off' under the Californian sun.

Laguna Seca is the tenth of 18 rounds and the final event before the summer break.

Championship leader Jorge Lorenzo will start on pole for the fourth successive year and be joined on the front row by Repsol Honda title rivals Casey Stoner and Dani Pedrosa.