The forecast has improved dramatically throughout the weekend, and should not impact Sunday's race at Dover International Speedway. The National Weather Service forecast is: A chance of showers before 2pm, then a slight chance of rain after 2pm. Cloudy, with a high near 65. Breezy, with a northeast wind around 24 mph. Chance of precipitation is 30%. So they might not get the full race in (starts 2:45) but they should get a race in before dark.