(Daytona, FL). The early part of the week here at the Daytona International Speedway is expected to be perfect. Local meteorologists are calling for the possibility of storms on Friday and Saturday with a spotty chance of rain for race on Sunday. Fridays activity here could be severe. Thursday are the Twin 150's, two races that set the starting grid for the Daytona 500, outside of the front row which has already been determined.