My 2011 370Z developed this exact same problem at 24k miles after storing the car for three months during the summer. Dealer said the rotor developed a "high spot" and that was the cause of the vibration on the front rotors. It was considered normal wear and tear and not covered. The brake pads were at 50%, but since I had a dealer service coupon for new brake pads, they would do new pads and resurface for basically the same cost as a resurface, so that's what I did. Never did they mention that I *had* to replace the pads to solve the problem.
My guess (I'm by no means an expert) is that the rotors rusted during the summer and fused to the pads. I had to give it a good amount of power to "unstick" them at the first drive, and that might have caused the variation in the rotor surface.
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