A big weekend of racing action is coming up this weekend on the streets of Belle Isle near Detroit, with IndyCar, IMSA, Trans Am, and Stadium Super Trucks all in action. After a chance of rain moves through on Friday, the weather pattern looks favorable for good conditions for racing over the rest of the weekend.
The models show a cold front moving through the Detroit area sometime on Thursday night or Friday morning. There is an upper level trough that lags behind the front, which moves through later in the day. While the majority of rain will come along the front, there will still be a chance of rain in the area until the upper trough moves through.
High pressure to the north over Canada will start to settle southward over the Great Lakes on Saturday, with an upper level ridge building as well. This will usher some cooler temperatures into the area, and create a pressure gradient that will produce some breezy conditions. A north wind at 10 to 20 mph and partly sunny skies will keep temperatures in the 60s for most of the day.
Some differences develop in the models for Sunday regarding the strength of the ridge and whether it gives way to a weak trough. For now I'm going with a forecast that maintains the ridge, as that seems to be the way most models are pointing. With a little more sunshine expected, high temperatures should rise into the 70s.