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, it will be the first time that Button and his team-mate Rubens Barrichello have driven the in the rain and tried running on the extreme wet tyres.

, Brawn were only able to take part in testing in Barcelona and Jerez where the sun was out and conditions were dry.

Button is tipped to claim back-to-back victories in Malaysia but could the weather dampen his chances?

"It makes it more difficult and more challenging that's for sure," said the Englishman, who battled wet weather to .

"We'll take it in our stride. We haven't tested in the wet yet but it's a good car and we hope it works well.

"The only thing we've got to work out are the front-wing angles because in the past we have had to massively adjust the car for wet conditions.

"For the last two years, we've come to circuits hoping for rain so it would throw a bit of excitement into the race because we would normally be hanging around at the back.

"But here, when you've got a quick car, you obviously want it to be dry and you don't want any safety cars, you don't even want a breath of wind."

The storm lasted for a full half an hour on Thursday afternoon; plenty of time to wreak havoc and turn the order upside down during a race.

Heavy rain is forecast for the next three days and on Sunday the race begins at 1700 local time.

There is growing concern that the 56-lap race could be cut short by poor visibility because of the combination of wet weather and dimming natural light.

"If it rains like this on Sunday we will need to organise a boat race," quipped .

, who finished sixth in Australia in a competitive Williams car, predicted: "If it doesn't rain then Brawn GP will win - the only way to change that is if it does rain."

If Rosberg is right then the other teams will be determined to make hay while the sun isn't shining in Malaysia.