 Tropical Storm Aka was the only tropical storm to form in the Central North Pacific during 1990 . An area of disturbed weather began to organize on August 6 . By August 7 , the system became well @-@ enough organized to become designated Tropical depression One @-@ C. The depression intensified into a tropical storm while moving west , to the south of the Hawaiian Islands . On August 10 , Tropical Storm Aka peaked with maximum sustained winds of 60 mph ( 97 km / h ) . The storm continued to move west and approached Johnston Island , though the island 's weather did not deteriorate . The tropical storm crossed the International Date Line on August 13 . Aka weakened back into a depression and dissipated two days later on August 15 . 
