sentences:  During January 12, the FMS reported that Tropical Depression 09F had developed over southern Tonga to the northwest of the island of Tongatapu.The system was located within an area of high vertical wind shear, while atmospheric convection associated with the system was active within the eastern and southern quadrants.Over the next day, the system moved south-southeastwards and its low-level cyclonic curvature became difficult to see in satellite imagery, before it was last noted later that day.