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This represents a stable rocket well into its flight - the rocket is flying straight. If a gust hits the rocket, there is a small force applied to the entire rocket. The net force F_aero is represented as a point force acting on the CP. (Since the center of pressure is the equivalent center of aerodynamic force, we can see this effect as a point force on the CP) we see that the rocket turns about the CG into the wind.
PICTURE OF BASIC ROCKET FBD W/ CG, CP AND GUST VECTOR
Let's consider the similar situation where the rocket is leaving the launch rail. It is guided vertically during the initial portion of its flight by the rail, and when the final rail button comes off of the rail, the rocket is free to move in 3 dimensions. If there is a relative wind, we end up with the following:
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