Petit Le Mans weekend at Road Atlanta will open with nice weather on Thursday as high pressure sits over the southeast U.S. – partly cloudy and high temperatures in the upper 70s. However, a cold front will be approaching from the west, and as high pressure gives way, a chance of showers and thunderstorms will arrive on Friday. At this point, most of the activity is expected in the afternoon. The chance of showers and thunderstorms appears highest Friday night. I don’t think there will be any severe weather, but some gusty winds and heavy rainfall may be possible if a stronger storm passes over the track. Timing is still uncertain this far out, and could change in later forecast updates, but right now it looks like the chance of rain will be decreasing through Saturday morning.