RAIN is predicted to hit the VAILO Adelaide 500, according to the Bureau of Meteorology.
Up to 15mm and a chance of a thunderstorm is forecast for Friday in Adelaide, which represents day two of the event.
The Repco Supercars Championship and Dunlop Series will both run qualifying sessions on the Friday, while all other support categories will hold races.
There is a smaller chance of rain on the other three days of the Adelaide 500.
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Thursday is listed as a 20 percent chance of rain, Saturday comes in at 60 percent (up to 3mm) and Sunday 30 percent (up to 1mm).
Maximum temperatures are forecast in the vicinity of 23 to 26 degrees.
Supercars has had minimal wet weather running in its first Gen3 season, with the only briefly wet event sessions coming at Albert Park and Gold Coast.
That has made for continuing unknowns regarding Dunlop’s new, softer wet tyre.