 The same monsoon trough that spawned Typhoon Koppu also produced an area of convection to the north @-@ northeast of Guam , becoming a tropical depression on October 19 . The system moved northwestward and later turned to the northeast around the subtropical ridge . With low wind shear and favorable outflow , the convection became better organized , and the JMA upgraded it to Tropical Storm Parma on October 21 . After an eye began to form , Parma was upgraded to typhoon status the next day . An approaching trough caused Parma to accelerate northeastward while also increasing outflow . On October 24 , the JMA estimated peak winds of 175 km / h ( 110 mph ) while the JTWC estimated winds of 240 km / h ( 150 mph ) , an unusually high intensity for 30 ° N. Subsequently , Parma rounded the subtropical ridge and began moving to the east @-@ southeast , beginning a nearly week @-@ long loop . The cold front had passed to the north and failed to bring the typhoon northeastward . 
 The same monsoon trough <a href='null_relcl' title='1'><mark>that</mark></a>spawned Typhoon Koppu also produced an area of convection to the north @-@ northeast of Guam , becoming a tropical depression on October 19 . The system moved northwestward and later turned to the northeast around the subtropical ridge . With low wind shear and favorable outflow , the convection became better organized , and the JMA upgraded it to Tropical Storm Parma on October 21 . After an eye began to form , Parma was upgraded to typhoon status the next day . An approaching trough caused Parma to accelerate northeastward while also increasing outflow . On October 24 , the JMA estimated peak winds of 175 km / h ( 110 mph ) while the JTWC estimated winds of 240 km / h ( 150 mph ) , an unusually high intensity for 30 ° N. Subsequently , Parma rounded the subtropical ridge and began moving to the east @-@ southeast , beginning a nearly week @-@ long loop . The cold front <a href='been_done' title='2'><mark>had</mark></a> passed to the north and failed to bring the typhoon northeastward . 
The same monsoon trough spawned Typhoon Koppu also produced an area of convection to the north @-@ northeast of Guam , becoming a tropical depression on October 19 . da system moved northwestward and later turned to tdanortheast around thdaubtropical ridge . With low wind shear and favorable outflow , the convection became betta organized , and the JMA upgraded it to Tropical Storm Parma on October 21 . After an eye began to form , Parma was upgraded to typhoon status the next day . An approaching trough caused Parma to accelerate northeastward while also increasing outflow . On October 24 , thedaA estimated peak winds of 175 km / h ( 110 mph ) while the JTWC estimated winds of 240 km / h ( 150 mph ) , an unusually high intensity fa 30 ° N. Subsequently , Parma rounded the datropical ridge and began moving to the eda @-@ southeast , beginning a nearly week @-@ long loop . The cold front done passed to the noda and failed to bring the typhoon northeastward .