An Indian Ocean low developed between Cocos and Christmas Islands on 21 March initially moving to the south then to the west late the following day. Initially hampered by moderate to strong wind shear, the system reached cyclone intensity at about 0900 UTC 23 March. Oscar continued its westward movement until 25 March when it tracked to the southwest and developed reaching category 4 intensity the next day. Increasing wind shear weakened the system markedly on 27 March. Perth TCWC issued the final shipping warning for Oscar at 1600 UTC 27 March when it moved west of 90E being renamed Itseng by La Reunion TCWC. The system continued to weaken and was below cyclone intensity late on 28 March. There were no known impacts from this cyclone.
For more details see the TC Oscar Report (pdf)
Track and intensity
All times in WST - subtract 8 hours to convert to UTC.