by Doug Schneider (@Race4caster)
The week leading up to the NASA 25 Hours of Thunderhill will be very wet, but it is expected that the rain will end in time for the race on Saturday and Sunday. Practice sessions on Thursday are likely to see some rain, and there's a good chance of seeing rain on Friday for qualifying. The timing of rain should come into better focus over the next few days. The upper level trough that is responsible for the rain will exit Friday night, which should leave nice weather for the entire race.