 The origins of Soudelor were from a tropical disturbance that persisted a short distance northwest of Pohnpei on June 7 . By two days later , it had a large area of convection , and it moved generally westward . Late on June 9 , the Joint Typhoon Warning Center ( JTWC ) issued a tropical cyclone formation alert ( TCFA ) , although the system initially failed to develop due to wind shear in the region . The thunderstorms decreased over the increasingly exposed circulation . On June 11 , the shear decreased , and convection became better organized . The JTWC initiated warnings on Tropical Depression 07W late that day , and at 0000 UTC on June 12 , the Japan Meteorological Agency ( JMA ) also remarked that a tropical depression had formed to the northeast of Palau . 
