Paddock setup on Wednesday will be mostly cloudy with temperatures topping out in the upper 50s. A low pressure system will be approaching from the west on Thursday, which will likely bring some rain to the track for the testing session. It will be breezy as the low pressure system gets closer, with winds of 10 to 20 mph. The rain will likely continue into Thursday night and early Friday morning as the cold front moves through the area. The total amount of rainfall is expected to be between a half inch and one inch. At this time, I expect that most of the rain will end in time for the start of testing at 9 am Friday. Clouds will be decreasing through the day as the low pressure system exits and high pressure builds over the area.
Saturday will likely have the nicest weather of the event, with partly cloudy skies and high temperatures near 60 degrees. Right now, I am fairly confident that the entire 25 hours of racing will be dry. There is another low pressure system that will be approaching on Sunday, but it looks like any rain with this system will hold off until late in the day, well after the end of the race.