A persistent tropical low was located in the region around 10°S 90°E. The low developed into Tropical Cyclone Cathy to the east of Cocos Island on 24 December. It moved southwards initially then was steered on a westward track as it intensified during Christmas Day. As it moved further westward it moved into an unfavourable upper wind shear pattern. By 27 December it had weakened below tropical cyclone strength.
For more details see the TC Cathy Report (pdf)
Track and intensity
All times in WST - subtract 8 hours to convert to UTC.