On Saturday, warm air at the surface will move in behind the front, with winds from the south to southwest bringing moisture to the region from the Gulf Coast. In the upper levels, a slight high pressure ridge is expected to build in after the passage of the shortwave trough. This will trap heat at the lower levels and surface, resulting in much warmer temperatures than Friday, with highs in the low to mid 90's. With the moisture from the Gulf, dew point temperatures are expected to be in the low 70's, causing the heat index to reach or even exceed 100 degrees. Again, with the Indycar series race starting in the evening, temperatures will cool as the night progresses. Drier air in the low levels will keep conditions partly cloudy through much of the day.
One thing to note for Saturday is there is a slight chance for scattered showers in the mid morning to early afternoon, but there should be no impact to the day's races. However, if there is a trend towards showers occurring later in the day, it will be noted in the next forecast update.