High Quality Content by WIKIPEDIA articles! Cyclone Catarina is one of several informal names for a South Atlantic tropical cyclone that hit southeastern Brazil in late March 2004. The storm developed out of a stationary cold-core upper-level trough on March 12. Almost a week later, on March 19, a disturbance developed along the trough and traveled towards the east-southeast until March 22 when a ridge caused the forward motion of the disturbance to cease. The disturbance was in an unusually favorable environment with below average wind shear and above average sea surface temperatures. The combination of the two led to a slow transition from an extratropical cyclone to a subtropical cyclone by March 24. The storm continued to obtain tropical characteristics and became a tropical storm the next day while the winds steadily increased. The storm reached winds of 75 mph (120 km/h)—equivalent to a low-end category one hurricane on the Saffir-Simpson Hurricane Scale—on March 26. At this time it was unofficially named Catarina and was also the first hurricane-intensity tropical cyclone ever recorded in the Southern Atlantic Ocean. Unusually favorable conditions persisted and Catarina continued to intensify and was estimated to have peaked with winds of 100 mph (155 km/h) on March 28. The storm made landfall later during the day at that intensity near the town of Torres. Catarina rapidly weakened upon landfall and dissipated the next day.