For the first time in the five year history of the Singapore Grand Prix the weather looks like playing a role in the proceedings.
Two hours before the start of opening practice the clouds burst and it rained heavily for over an hour. The track was drenched but with hot temperatures and high humidity the conditions should improve quickly.
The GP2 cars were out on track and the conditions improved considerably throughout the session which was headed by Esteban Gutierrez.
The Formula 1 cars will be on track within the hour and while the conditions will remain treacherous a dry line should develop in the opening half of the session.
The weather forecast for the remainder of the weekend is much more promising so it will be interesting to see if any of the leading drivers view it as an acceptable risk to run in the early stages of FP1 where the smallest of errors are likely to be punished by an accident.
As ever at a street circuit the teams will be chasing their setup throughout the weekend as conditions change from one session, and indeed one lap, to the next. Losing track time has a much greater implication on drivers on these types of tracks so the risk/reward of taking part in the opening session for the leading drivers will be interesting to watch.