(This article is about the Atlantic hurricane of 2010. For other storms of the same name, see Hurricane Otto.) Hurricane Otto produced days of torrential rain over much of the northeastern Caribbean in October 2010. Otto originated as a subtropical cyclone lingering north of Puerto Rico on October 6, and transitioned into a tropical storm the next day, the fifteenth of the 2010 hurricane season. Accelerating toward the northeast, Otto strengthened into a Category 1 hurricane on the Saffir–Simpson scale on October 8, attaining peak winds of 85 mph (140 km/h). The storm began weakening due to incompatible surroundings and became extratropical west of the Azores on October 10. Otto was the first Atlantic tropical cyclone on record to transition from a subtropical storm since Tropical Storm La