Heavy rain has started at Gulfstream as the fourth race approaches, with post time around 1:50 p.m.
It will start the Rainbow 6, with a carryover of $636,677. Gulfstream has guaranteed that the jackpot pool will be at least $900,000 if there are no tickets with all six winning horses.
Races 5, 7 and 9 are off the turf.
The dirt has been upgraded to Fast. But that could be changed if rain continues.