sentences:  On December 26, RSMC Nadi reported that Tropical Disturbance 06F had developed about 680 km (420 mi) to the northeast of Avarau on the Southern Cook Island of Rarotonga in an area of high vertical windshear.Over the next couple of days, the system moved towards the south and convection surrounding the system remained unorganized, while the low level circulation centre was detached from the convection and became exposed.The disturbance was last noted by RSMC Nadi on December 28, as it approached TCWC Wellington's area of responsibility.