The storm weakened soon after , dissipating in the Sea of Japan on July 18 .
Nangka later weakened as it curved to the north , moving across central Japan on July 16 as a minimal typhoon .
The storm weakened soon after , dissipating in the Japan     on July 18 .
Nangka later weakened as it curved to the north , moving across central Japan on July 16 as a minimal typhoon .