Kirk was the 12th tropical cyclone in the 2018 Atlantic Hurricane Season. It formed as a tropical storm over the eastern tropical Atlantic Ocean on 22 September 2018 at 1500UTC. Along its movement toward the east north-east, it was downgraded to an open trough on 24 September at 1500UTC and regenerated as a tropical storm on 26 September at 0900UTC. Kirk presented a strong vertical sheared shape, with the maximum winds at the north and east of the centre.