Moving southwards, it strengthened to Tropical Cyclone Robyn on 3 April, reaching Category 2 the next day. Over the next few hours northwesterly wind shear increased and took its toll on the cyclone. After a counter-clockwise loop the cyclone was steered to the west, due to a strengthening ridge to the southwest of the system. On 6 April 06:00 UTC the TCWC Perth downgraded Robyn to a tropical low. On 21 April, TCWC Perth reported that a tropical low had formed at 10.3ºS, 116.4ºE, and designated it 13U. The next day it was upgraded to Tropical Cyclone Sean. Sean moved south and kept a steady track. It dissipated on 25 April. In June 2010, the Bureau of Meteorology retired the names "Laurence" and "Magda". They were later replaced by "Lincoln" and "Megan" respectively. The name "Ului" was also retired by the Regional Specialized Meteorological Center and was replaced by "Vanessa" after it caused damage over in Eastern Australia.