Shanshan formed as a tropical storm on August 22, 2024 in the Philippine Sea. The storm then slowly moved northwestward, strengthening into a very strong typhoon on its approach to the southern Japanese islands.

On August 29, 2024, Shanshan made landfall on the island of Kyushu as a typhoon with category one hurricane winds. Shanshan then weakened slightly, but still brought heavy rain to parts of Japan. Nearly two feet (60cm) fell on the Miyazaki prefecture on the island of Kyushu in a 24-hour period– more rain than they usually see in all of the month of August.

Directed by a sub-tropical high, slightly weakened Tropical Storm Shanshan quickly crossed the Seto Inland Sea and made landfall again over the island of Shikoku on August 30.

The following day, Shanshan weakened further over open water, displaying exposed central circulation, and the JTWC issued its final warning for the system.

On September 1, Shanshan re-intensified into a weak tropical depression before moving inland over Japan and dissipating.

For more information, visit the Joint Typhoon Warning Center and the Japanese Meteorological Agency.