 Convection formed in the eastern end of the monsoon trough just north of Guam on August 20, leading to the formation of a weak low pressure area by late morning August 21. The system slowly consolidated as it moved northwest, and was separating from the monsoon trough on August 23. Although convection increased in organization, the surface wind field did not respond. Nevertheless, it was deemed a tropical depression on the morning of August 24. By the next morning, the surface circulation became exposed as upper level conditions worsened due to strong southerlies aloft. The cyclone was no longer deemed tropical at that time. The surface cyclone moved northwest, crossing the Ryūkyū Islands before it merged with a frontal zone in the northern East China Sea late on August 26.
