Just as Autopilot can react to an obstacle in your path faster than your meager human reflexes could ever hope to match, so to does it handle crosswinds pushing it the car off track and the cessation of those crosswinds. Where a human driver would have to correct after realizing the push of the wind and then correct again after shooting over in the other direction after the wind stops, Autopilot (and, presumably, FSD) can make those corrections in real time.