 The initial tropical disturbance formed on November 30 in the wake of Kim near the International Dateline . The system moved west @-@ northwest , developing into a tropical depression and tropical storm on December 4 . Lex remained a tropical storm for one day , before weakening back into a tropical disturbance on December 5 due to vertical wind shear caused by Typhoon Kim and an upper trough nearby from the northwest . The depression passed between Guam and Saipan on December 7 . Lex recurved south of Iwo Jima on December 8 before becoming an extratropical cyclone on December 9 . 
