 Hurricane Olivia ultimately formed from a disturbance that had separated from the intertropical convergence zone and become distinct by September 19 . The disturbance slowly headed westward and it organized into a tropical depression on September 22 while located about 720 miles ( 1 @,@ 160 km ) south of the southern tip of the Baja California Peninsula . The depression headed west @-@ northwestwards and strengthened into Tropical Storm Olivia on September 22 . It steadily intensified and was a hurricane on September 24 . It then rapidly strengthened into a powerful major hurricane . It slowly curled to the northwest as it was observed by NOAA research aircraft . Olivia peaked in intensity on September 25 . Meanwhile , a large cyclone off the extreme southern part of California induced a northward path . As Olivia started a small anticyclonic loop , wind shear began to weaken the hurricane . When Olivia was finished the loop , it had weakened to a tropical storm . It then headed westward . It weakened into a tropical depression on September 28 and dissipated the next day . No impact was reported . 
