As forecast, the fringes of a passing typhoon has doused the Korea International Circuit with rain for much of the morning leading up to the first-ever Korean Grand Prix.

The weather change was widely predicted after qualifying on Saturday, and could play a major role in shaping both the outcome of the race and the 2010 world championship.

Even on full wets, cars heading to the grid were spinning or running wide as they searched for grip on the still dirty and unpredictable surface, and the only other race on the schedule lasted less than a lap before the safety car was called upon.

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Bernd Maylander may find himself pressed into action again should the conditions be deemed too dangerous for a traditional grid start, especially if the two-week old tarmac layer prevents the rain from soaking into the surface.

There could also be problems in the pit-lane where the concrete surface has proved slippery all weekend, even in the dry.