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 that produced intense lightning.

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.

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The main track, which is dirt, was labeled sloppy at 8 a.m. EDT. The Derby will be run at 6:32 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.