. >> you're going to see all kinds of preppy shades from creamsicle orange to pale blues, pale pinks.so it's really about color for the guys. >> reporter: the mint julep has been the derby's official drink for nearly a century. they'll serve 120,000 here this weekend. but none quite like this. the $1,000 mint julep. the money goes to charity. >> for $2,000 you get this wonderful 24 karat gold plated cup, with 43 diamonds in the horseshoe. >> reporter: but if you were hoping for that little souvenir, too late. it's already sold out. but there's still plenty of money floating around. in fact they've increased the purse for this year's derby. it's now over $2 million. at churchill downs, i'm tracie potts. back to you, lynn. >> all right, tracie, thanks so much. nbc's going to have coverage of the derby live from churchill downs, beginning tomorrow, 4:00 p.m. eastern time, on your local nbc station. all right, what about the weather for the derby? that's the big headline there. bill karins is looking at that. >> it will be -- it will be interesting. because there's going to be thunderstor