The 2005 Azores subtropical storm was a type of tropical cyclone in the 2005 Atlantic hurricane season. The storm was not named by the National Hurricane Center, because it was not found until after the season ended. The storm formed in the Atlantic Ocean, and it became a "subtropical cyclone" on October 4. The storm did not last a long time. It passed over the Azores, and it stopped being a subtropical cyclone on October 5. What was left of the storm went on to become Hurricane Vince. After the hurricane season ended, the National Hurricane Center checked to make sure they did not miss any storms during the year. Some forecasters found this storm, which was not noticed while it was active.