By: Stephen McCoy - @stephenmmcc
With the warm front passing on Friday, expect clear to mostly clear conditions for Saturday at Gateway Motorsports Park. Warm air at the surface is still expected to move in to the area behind the front, with moisture being brought to the region from the south to southwest off the Gulf Coast. The combination of air temperatures in the low 90's and dew point temperatures in the low 70's will raise the heat index to around 100 degrees. Winds speeds are likely to be higher as the pressure gradient at the surface looks to be stronger than in the previous forecast. In addition, some gusts could approach 20mph as the low level winds are expected from the same direction as at the surface. Race time conditions will be slightly cooler with temperatures in the mid 80's and falling as the evening progresses. However, dew point temperatures are likely to remain steadily in the low 70's, so as a result relative humidity will slowly increase; surface winds also are expected to decrease into the night.