On 27 March, TCWC Darwin noted that a weak Tropical Low had formed in the w:Arafura Sea. Over the next few days, the Tropical Low drifted northwards into the w:Banda Sea where it began to intensify slowly. w:JTWC issued a w:Tropical Cyclone Formation Alert but was soon canceled due to the lack of w:Coriolis effect and land interaction. Early on 31 March, w:Joint Typhoon Warning Center downgraded Tropical Low 21U to "Poor", due to the loss of Low Level Circulation Centre (LLCC) and issued a cancellation of a w:Tropical Cyclone Formation Alert. Later that day, TCWC Darwin noted that the low remained weak and disorganised with the structure of the low hadn't improved in the last 12 hours. TCWC Darwin also noted that the low was unlikely to form into a tropical cyclone due to a low to mid-leve