A low pressure trough in the mid and upper levels of the atmosphere will be over Texas on Thursday, and with plenty of tropical moisture in the area, there will be numerous showers and thunderstorms near COTA. Some of the rain may be quite heavy if a storm passes directly over the track. With the chance of rain being at 60% and the potential for the rain to be heavy, I have rated the Impact as Moderate, meaning that there may be some interruptions or delays to some on-track sessions.
The trough will be tracking slowly east on Friday, but it will still be close enough to COTA that I have to keep a small chance of rain in the forecast for Friday. I expect that most of the showers will occur on Friday morning, with clearing conditions through the afternoon.
A large high pressure system will start to take hold across much of the central United States on Saturday, extending across Texas. It will remain firmly in control of the weather through the weekend, providing sunny skies both Saturday and Sunday, with comfortable temperatures and lower humidity.