The NTT Indycar Series along with the USF2000 and IndyPro 2000 makes a trip to Road America for the REV Group Grand Prix weekend.
USF2000 & Indy Pro 2000 (Thursday & Friday)
An active pattern looks to bring a good chance of rain and thunderstorms mainly during the afternoon and early evening hours on Thursday for testing and practice sessions for both series. Temperatures will start off around 80 degrees and warm to around 89 degrees for the daytime high. Winds will be out of the southwest to south at 5-10 MPH. Rain chances will start off around 40% early but will max out at 70% by the early afternoon and persist through the end of the racing day.
Rain may hold off for most of the day on Friday until the late afternoon hours before the end of the racing day. I'm still going to include a very small chance of rain early but those odds will max out around 30% during the afternoon hours. Winds will be out of the west at 5-10 MPH. Temperatures will start of around 75 degrees and will warm up to around 85 degrees by the afternoon.
NTT Indycar Series (Saturday & Sunday)
Whether you would like to see the fastest racers in the world drive in the dry or in the wet, it looks like the dry-weather fans may win out this weekend. Saturday and Sunday will feature a great deal of sunshine early on, but convective clouds will slowly build during the late morning and early afternoon hours. There will be a very small chance of a passing shower or thunderstorms, but those will not be very likely. Saturday's temperatures will start off around 82 degrees for the first session and top out around 83 degrees during the afternoon. Sunday's temperatures will be around 76 degrees for qualifying and topping out around 80 degrees by the afternoon. Chance of rain on both days is barely at 20%.