Hurricane Leslie (known as Storm Leslie or Cyclone Leslie in Portugal and Spain while extratropical) was the strongest cyclone of tropical origin to strike the Iberian Peninsula since 1842. A large, long-lived, and erratic tropical cyclone, Leslie was the twelfth named storm and sixth hurricane of the 2018 Atlantic hurricane season. The storm was of non-tropical origin, developing from a large low-pressure system that developed over the northern Atlantic Ocean on 22 September.