Summary
The unnamed tropical cyclone 25U was deemed to have briefly reached tropical cyclone intensity upon reanalysis. It moved close to the Cocos (Keeling) Islands in the Indian Ocean on 18 March and produced a period of strong winds and increased rainfall. However, no impacts were reported.
25U formed as a tropical low to the south of Christmas Island on 17 March 2025 during an active phase of the Madden-Julian Oscillation and initially moved in a generally westward direction. During 18 March, the environment became more favourable and the low developed gales in the western quadrants late that day. By 1800 UTC 18 March, gales extended more than halfway around the system centre and 25U was classified as a tropical cyclone. At this time, 25U was located to the southwest of the Cocos (Keeling) Islands. By 1200 UTC 19 March, gales had contracted to only the western quadrants and 25U was again classified as a tropical low. During 19 and 20 March 25U was generally slow moving with erratic motion. From 21 March the system drifted generally to the east with continued erratic motion before dissipating during 25 March.
For more details see the TC Unnamed 25U Report (docx)
Track and intensity (Time in UTC)
