 A blob of thunderstorms was noticed about 600 kilometres ( 370 mi ) southeast of Guam on June 18 . It tracked westward , without significant development until June 20 while passing south of Ulithi Atoll . Steering currents collapsed , and the system drifted between Ulithi and Yap for the next couple of days . By the morning of June 21 , the system had strengthened into a tropical storm . The system drifted north to northwest , then northeast towards Guam . Ruby waited to detach from the monsoon trough before further strengthening was realized on June 23 . Steady intensification ensued , and the cyclone accelerated northward , becoming a typhoon on the afternoon of June 24 . Ruby became an extratropical cyclone on June 27 , occluding and becoming nearly stationary east of Hokkaidō for several days . Two vessels with a collective crew of 42 people became stranded off the coast of Honshu during the typhoon . The 19 crew of the No. 10 Soichi @-@ Maru were rescued while the 23 members on the No. 8 Takojima @-@ Maru remained missing . 
