I hope the race is completely wet otherwise things could get a bit complicated!
“The warm-up starting at 10:40 will now be for 30 minutes, finishing at 11:10. This will apply whether the track is dry or wet.
“If the track is dry for the warm-up riders should use the replacement rear tyre (Option Tyre).
“If the track is wet for the warm-up then the plan to provide extra practice sessions with the Option tyre is cancelled and the race will be held using the tyres from the original allocation.
RACE
“If the race starts in dry conditions if the warm-up has been dry then riders must start with the Option tyre and the race will be for the full 25 laps. The normal flag to flag conditions will apply if the track becomes wet.
“If the race starts in dry conditions when the warm-up has been wet then riders may use either of the rear slick tyres (Medium & Hard of their allocation for Argentina). However, the race will be “flag to flag” for 20 laps with a compulsory stop to change machines at the end of lap 9, 10 or 11.
“If the race starts in the wet and the track dries then Race Direction will decide if it is unsafe for the riders to continue in which case the race will be red flagged. The new “dry” race will then be restarted for ten laps with a 15 minute start procedure. Should the track become wet during this race the riders may change machines as normal.
“If the race starts in wet conditions and remains wet then the race will be for the normal 25 laps.
“Under no conditions will the use of intermediate tyres be permitted.
“Race Direction”
Read more at http://www.crash.net/motogp/news/229066/1/argentina-motogp-the-race-options.html#1e3yjtM1v3ey8BRC.99