Naysen,
I get the same (or very similar) on my tomatoes starting about this time of year. I don't have a positive ID on mine but I've been calling it 'Leveillula taurica' (Powdery Mildew). A photo of early infection is shown here:
http://www.ipm.ucdavis.edu/PMG/r783100411.html
It seems sulfur is an effective control so, on at least a few plants, you might want to discontinue any of the oil sprays in your spray rotation in anticipation of applying sulfur.
Good luck, keep us posted,
Steve