sentences:  The Joint Typhoon Warning Center and Météo-France issued its final advisory on December 21 as it transitioned to an extratropical system.Early on December 30 an area of disturbed weather formed west of Madagascar and was designated as 06R.Later that day it was upgraded to Tropical Disturbance 06R, whilst the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on the developing system.