LOUISVILLE, Ky. -- The track superintendent at Churchill Downs cancelled morning training for the Kentucky Derby and its 13-race card after a night of thunderstorms.
Butch Lehr (LEE'-ehr) made the decision early in the morning as crowds began to line up outside the historic Louisville track. Saturday is the 138th running of the Kentucky Derby.
The main track, which is dirt, was labeled sloppy at 8 a.m. EDT. The Derby will be run at 6:24 p.m. EDT, with the National Weather Service calling for mostly cloudy skies, a high near 85 and a 50 percent chance of pop-up rain.
Hundreds of thousands of race fans, topped off by a bevy of celebrities, are expected to converge at Churchill Downs. Last year, more than 164,000 people attended, an all-time high.
Daddy Long Legs, who disappointed in the Breeders' Cup Juvenile in his previous visit to Churchill, returned with a strong win in the Group 2 U.A.E. Derby over the Tapeta at Meydan. (Alan Crowhurst/Getty Images)
Exercise rider Joel Cano and trainer Wayne Lucas walk Kentucky Derby entrant Optimizer off the track after a workout at Churchill Downs Tuesday, May 1, 2012, in Louisville, Ky. (AP Photo/Morry Gash)
Take Charge Indy, ridden by Calvin Borel, wins the Florida Derby horse race at Gulfstream Park on Saturday, March 31, 2012, in Hallandale Beach, Fla. (AP Photo/Gulfstream Park, Adam Coglianese)
Union Rags, ridden by Julien Leparoux, captures the Fountain of Youth horse race Sunday, Feb. 26, 2012, at Gulfstream Park in Hallandale Beach, Fla. (AP)
Jockey Kent Desormeaux guides Dullahan to a 1 1/4-length victory in the $750,000 Blue Grass Stakes at Keeneland Race Course in Lexington, Ky., Saturday, April 14, 2012. (AP Photo/Garry Jones)
Kentucky Derby hopeful Bodemeister, under exercise rider Peter Hutton, tunes up on the track at Churchill Downs in Louisville, Ky., Tuesday, April 24, 2012. (AP)
Jockey Rafael Bejarano, right, hold off Rousing Sermon, ridden by jockey Joseph Talamo, left, while riding Liaison to victory in the $100,000 Real Quiet Stakes horse race, Saturday, Nov. 12, 2011, at Hollywood Park in Inglewood, Calif. (AP Photo/Benoit Photo)
Heinz Steinmann's Creative Cause and jockey Joel Rosario win the Grade II, $300,000 San Felipe Stakes horse race, Saturday, March 10, 2012, at Santa Anita Park in Arcadia, Calif. (AP Photo/Benoit Photo)
Jockey Willie Martinez rides Trinniberg to win the Grade III Bay Shore horse race at Aqueduct, Saturday, April 7, 2012, in New York. (AP Photo/New York Racing Association)
Groom Geraldo Morales washes Kentucky Derby hopeful Daddy Nose Best after a morning workout at Churchill Downs in Louisville, Ky., Monday, April 30, 2012. (AP Photo/Charlie Riedel)
Alpha, with jockey Ramon A. Dominguez, captures the Withers horse race at Aqueduct in New York. (AP Photo/New York Racing Association, File)
Exercise rider Juan Bernardini gallops Kentucky Derby hopeful Prospective over the track at Churchill Downs in Louisville, Ky., Tuesday, April 24, 2012. (AP Photo/Garry Jones)
Exercise rider Zeke Castro walks Kentucky Derby entrant Went the Day Well after a workout at Churchill Downs Tuesday, May 1, 2012, in Louisville, Ky. (AP Photo/Garry Jones)
Hansen, ridden by Ramon A. Dominguez, races to the finish to win the Gotham Stakes horse race at Aqueduct in New York. (AP Photo/NYRA, Adam Coglianese, File)
Gemologist, ridden by Javier Castellano, wins the Wood Memorial horse race at Aqueduct racetrack Saturday, April 7, 2012, in New York. (AP)
El Padrino (7) with jockey Javier Castellano pulls ahead of Mark Valeski with Rosie Napravnik to win the Risen Star Stakes horse race at Fair Grounds in New Orleans, Saturday, Feb 25, 2012. (AP Photo/Hodges Photography, Lou Hodges, Jr.)
Done Talking is ridden on the track during the morning exercise session in preparation for the 138th Kentucky Derby at Churchill Downs on May 1, 2012 in Louisville, Kentucky. (Photo by Matthew Stockman/Getty Images)
Sabercat wins the Delta Downs Jackpot Grade III, in Vinton, La Saturday, Nov. 19, 2011. (AP Photo/Coady Photography)
Kentucky Derby hopeful I'll Have Another gallops at Churchill Downs in Louisville, Ky., Monday, April 30, 2012, under exercise rider Johnny Garcia. The 138th running of the Kentucky Derby is Saturday, May 5.(AP Photo/Garry Jones)
Jockey Martin Garcia rides Kentucky Derby hopeful Liaison during a morning workout at Churchill Downs in Louisville, Ky., Monday, April 30, 2012. The Kentucky Derby horse race is scheduled for Saturday, May 5. (AP Photo/Charlie Riedel)