 Typhoon Paka continued to steadily intensify after passing the Marianas Islands , and late on December 17 it reached its peak intensity of 185 km / h ( 115 mph 10 min sustained ) while located 440 km ( 275 mi ) west @-@ northwest of Guam . Early on December 18 , the JTWC assessed it as attaining peak winds of 295 km / h ( 185 mph 1 min winds ) . On December 19 , it entered the area of responsibility of the Philippine Atmospheric , Geophysical and Astronomical Services Administration , or PAGASA , and was named Rubing . Shortly thereafter , Paka moved through an area of progressively increasing wind shear , which resulted in a steady weakening trend . By December 21 , winds decreased to tropical storm status . The next day , it degenerated into a tropical depression before it dissipated on December 23 . 
