The 145th Kentucky Derby is here, and the field of Thoroughbreds may have to endure a sloppy track at Churchill Downs for the second year in a row. Rain started falling at Churchill Downs on Saturday afternoon, and could continue until post time.

A rainy day in Louisville, Kentucky did muddle up the course last year, when eventual Triple Crown winner Justify took the first jewel, and this year's Run for the Roses projects to be on the wet side as well.

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Let's take a look at updated weather forecasts for "The Fastest Two Minutes in Sports". Just about a week before the race, all signs pointed to a mostly sunny afternoon with a slight chance of a thunderstorm -- and cool conditions for the evening, with post time set for about 6:50 p.m. ET. But since then, rain has been in the forecast for has taken over the radar:

2019 Kentucky Derby forecast

Service: The Weather Channel
Projected weather: Rainy
Projected temperatures: 67 degrees (high), 55 degrees (low)
Race-time projection: Steady rain in the evening
Chance of rain: 80 percent (60 percent evening)

Service: AccuWeather
Projected weather: Periods of rain; not as warm
Projected temperatures: 67 degrees (high), 55 degrees (low)
Race-time projection: Mostly cloudy with occasional rain
Chance of rain: 70 percent (72 percent evening)