Wednesday will have a good chance of rain showers all day, but it will be the warmest day of the event, with highs in the upper 70s. On Thursday the cold front at the surface will have moved through, bringing cooler temperatures. However the upper level trough is slow to exit, and will be over Georgia through the day. This will result in some scattered showers around the track all day. The trough is expected to slowly move away, taking most of the deep moisture with it, so I don't expect that the showers will last into Friday at this time. If the models continue to show a slower system, I may need to add a chance of rain into Friday.
Race day continues to look really nice as high pressure builds over the area. Mostly sunny skies and highs in the lower 70s can be expected. Temperatures by the end of the race will drop to around 60, so bring a jacket.