INDIANAPOLIS — A system to the southeast will slowly move to the northwest. This will allow cloud coverage to increase overnight and more moisture to move into the atmosphere. Temperatures will fall into the mid 50s, with a light wind out of the east-northeast.
Race Day will be mostly cloudy, thanks to the system to the south.
Surface dewpoints will be rather dry Sunday morning, only in the mid-to-upper 40s.
The forecast for precipitable water, which depicts the amount of moisture in the atmosphere at a fixed point, does show some increasing moisture in the mid-levels at 8 a.m..
While there will be a chance of a spotty shower, the best chance will be southeast Indiana during the afternoon or evening.
Cloud coverage will be thicker in southeast central Indiana, keeping temperatures down a bit. Afternoon highs will be warmer in north central Indiana, where cloud coverage will be thinner.
If you are heading to the track, count on it to be mostly cloudy and mainly dry. There is an outside chance of a spotty shower, but the race will get in. Afternoon highs will climb into the low 70s.