Low pressure is tracking across the Great Lakes region this morning, with a cold front located across Lake Erie and Ohio, moving east. Here's a look at the radar around 8:30 am (WGI is the red dot):
If the expected timing works out, there could be some rain for the later half of Continental Tire qualifying, particularly the GS session, and the Prototype Lites race at 2:30 pm. I expect that the rain will last into the WeatherTech Championship practice at 3:20 pm as well. Scattered showers may linger around the area into the Porsche GT Cup race.
Rain amounts around the area will average around a quarter inch, with up to a half inch possible if a heavier shower passes over the track.
High temperatures today will reach to near 80 degrees, with southwest winds at 5 to 10 mph.
Saturday and Sunday continue to look great, with plenty of sunshine both days and high temperatures in the upper 70s to around 80. Winds on Saturday will be a little stronger, from the northwest at 10 to 15 mph.
I'll have weather updates on my Twitter account through today - @Race4caster.