Rainbow 6

A powerful thunderstorm and threat of continuing downpours through the afternoon caused the cancellation of racing at Gulfstream Park prior to the sixth of 12 scheduled races Sunday. The card was the closing day program of Gulfstream's Championship meet. A mandatory payout of the 20-cent Rainbow 6 jackpot pool, which was slated for Sunday's program, will be rescheduled. There is a carryover of $288,488.31 from Saturday's Florida Derby Day card. Live racing resumes Thursday at Gulfstream with the opening of the spring-summer Royal Palm Meet, which runs through Aug. 31....