Rain adds to uncertainty for Formula 1 opener

The start of any new Formula One season is uncertain enough for teams and drivers without the addition of wet weather, which is expected for this years opening Australian Grand Prix.The forecast for Melbourne is for rain and possible thunderstorms from Friday through to race day on Sunday, which will render much of the best-laid preseason preparations and learned predictions irrelevant.Throw in the always-slippery Melbourne street circuit, guessing games about the behavior of the new Pirelli tires, and uncertainty over how teams have adapted to the new rules, and this weekends season opener appears about as unpredictable as any F1 race could be.